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NEWARK, N.J. – A New Jersey serial killer serving 160 years in prison for killing three women he lured through dating apps has been charged with murder in the death of a 15-year-old girl who vanished in 2016.

Mawa Doumbia, of Newark, was last seen alive as she left her family’s home on Oct. 7, 2016, according to Essex County prosecutors. The teen remained missing for more than two years until her decomposed remains were discovered April 19, 2019, in nearby Orange.

Doumbia had been strangled and left lying facedown on the second floor of a vacant carriage house. Her remains were positively identified in November 2021.

Doumbia was identified about a month after her alleged killer, Khalil Wheeler-Weaver, 24, of Orange, was sentenced in the murders of Robin West, 19, of Union Township; Joanne Brown, 33, of Newark; and Sarah Butler, 20, of Montclair. He was also convicted of kidnapping, sexual assault and attempted murder in an attack on Tiffany Taylor, who survived.

Authorities allege that Wheeler-Weaver, who has denied committing the murders, used dating apps to lure women and teen girls to remote locations over an 88-day period in 2016. He then fatally strangled them.

He was caught after Butler’s sister and friends turned the tables on the killer. Using the same app through which he met the slain woman, they lured him into a trap.

Serial killings:

Convicted serial killer Khalil Wheeler-Weaver is serving 160 years in prison for the murders of, clockwise from left, Sarah Butler, 20, Joanne Brown, 33, and Robin West, 19, in 2016. He is now accused of the October 2016 murder of Mawa Doumbia, 15, of Newark, N.J.

Essex County officials said that it was his actions online that tied Wheeler-Weaver to Doumbia’s killing.

“Following an investigation involving extensive digital evidence, it was determined that on Oct. 7, 2016, Wheeler-Weaver met the young girl online and solicited her to meet him in person for sex,” prosecutors said in a statement. “It is alleged that he traveled to the area of her residence, then to the murder scene, where he strangled her to death and left her remains concealed within the vacant building.”

Doumbia’s slaying mirrors those of West, Brown and Butler, as well as the near-fatal attack on Taylor. Along with Butler’s loved ones, Taylor has been credited with helping to bring Wheeler-Weaver to justice.

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Taylor spoke publicly at Wheeler-Weaver’s sentencing in October.

“My whole life is different; I don’t wear makeup anymore; I don’t have friends,” Taylor said, according to The Associated Press. “I’m always paranoid. But I’m happy to still be here.”

Taylor urged Superior Court Judge Mark S. Ali to show no mercy to the convicted killer.

“I hope you don’t show him any remorse, because he’s not showing any remorse,” Taylor said, according to the AP.

Serial killer sentenced:

Tiffany Taylor, forefront, speaks at the Oct. 6, 2021, sentencing hearing of Khalil Wheeler-Weaver, seen in white mask in the background. Wheeler-Weaver was sentenced to 160 years for murdering three women and the attempted murder, kidnapping and sexual assault of Taylor in 2016. reported that Wheeler-Weaver denied culpability in a brief statement to the judge.

“I do feel sympathy for the victims. My heart goes out to the families and friends,” Wheeler-Weaver said. “However, I was not the person who committed these crimes.

“I was set up. I was lied on and framed by the Essex County Prosecutor’s Office.”

‘You’re not a serial killer, right?’

Wheeler-Weaver was convicted in December 2019 of 11 charges that also included aggravated arson and desecration of human remains. His sentencing was pushed back several times because of the COVID-19 pandemic.

Like many repeat killers, Wheeler-Weaver targeted marginalized women. Assistant Prosecutor Adam Wells, who tried the case, said West, Brown and Taylor had all been homeless at some point and resorted to sex work to survive.

Wheeler-Weaver’s method of killing the women was similar across the board: He would set up meetings with them for sex then attack them, wrap their faces in tape, and strangle them with an article of clothing, the North Jersey Record reported.

Serial killer sentenced:

Khalil Wheeler-Weaver, 25, of Orange, N.J., was sentenced to 160 years in prison Wednesday, Oct. 6, 2021. He was convicted in 2019 of three murders, as well as kidnapping, sexual assault and attempted murder of a fourth woman.

The murders began with West, a Philadelphia native who had gone to North Jersey on Aug. 31, 2016, to celebrate her upcoming 20th birthday. According to WHYY in Philadelphia, her family grew worried when they could no longer reach her to discuss the party they were planning.

Her body was found Sept. 1 after firefighters extinguished a fire at an abandoned house on Lakeside Avenue in Orange. It took authorities nearly two weeks to identify what remained through dental records.

“Her mom called me and said, ‘Oh, they found Robin,’” West’s father, Leroy West, told WHYY in 2017. “I immediately got excited. I said, ‘Well, let’s put some gas in the car and let’s go get her.’ And she said, ‘No, they found her body.’”

Witnesses had seen West get into a vehicle with Wheeler-Weaver, who police initially described as a “calm” and “helpful” witness, according to He told detectives he’d taken West out to lunch and dropped her off at an abandoned building in Orange.

Serial killer sentenced:

A June 2019 Street View image shows the lot where Robin West’s body was burned in an abandoned house in Orange, N.J. Khalil Wheeler-Weaver, 25, of Orange, has been sentenced to 160 years in prison for the murders of West, 19, Joanne Brown, 33, and Sarah Butler, 20, in 2016, as well as an attack on a fourth woman.

He even took them to the building, which was less than two blocks from the torched home where West’s charred body had been found. At that point, West was still considered missing because the body had not yet been identified as hers.

As homicide detectives puzzled over West’s death, a second woman vanished.

Brown, who authorities said was struggling with mental health issues and homelessness, was last seen alive Oct. 22, 2016. Like West, she had been seen getting into Wheeler-Weaver’s vehicle.

When she last spoke to a friend, it was from a phone number tied to Wheeler-Weaver, reported.

Contractors found her decomposing body Dec. 5 at a vacant house on Highland Avenue in Orange. Tape covered her nose and mouth, and a jacket was tied around her neck like a ligature.

She had been strangled.

Serial killer sentenced:

A September 2021 Street View image shows the formerly-vacant Orange, N.J., home where Joanne Brown’s body was found by contractors in December 2016. Khalil Wheeler-Weaver, 25, of Orange, has been sentenced to 160 years in prison for the 2016 murders of Brown, 33, Robin West, 19, and Sarah Butler, 20, as well as an attack on a fourth woman.

The vacant property where Brown’s body was found is just over a half-mile from where Wheeler-Weaver lived with his mother, according to

Meanwhile, two incidents had taken place in November. On Nov. 15, 2016, Taylor, who was several months pregnant and needed money, agreed to meet with Wheeler-Weaver for sex.

Taylor, who was 34 when she was attacked, testified at trial that she had been previously acquainted with Wheeler-Weaver, who she had once conned out of cash.

On the night of the attack, she didn’t realize it was him who had answered her ad, reported. Taylor said she didn’t recognize him when they met up at her Elizabeth motel room because he wore a half-face ski mask.

It was cold that night, she said, so she didn’t think the mask was unusual.

Serial killer sentenced:

Online records show that convicted serial killer Khalil Wheeler-Weaver, 25, lived with his mother in this Orange, N.J., home. Wheeler-Weaver was sentenced Wednesday, Oct. 6, 2021, to 160 years in prison for the murders of three women in 2016, as well as an attack on a fourth woman, who survived.

Taylor said they drove around for a while but were unable to get a motel room together because neither was carrying identification. She testified they were about to part ways when she was struck in the head.

He then handcuffed her, covered her mouth with duct tape and raped her in the back seat of the car while strangling her, Taylor testified. She repeatedly lost consciousness during the sexual assault.

Afterward, he removed his mask and asked if he looked familiar, reported.

“He was, like, ‘You took my money,’” Taylor said.

Terrified for her life, Taylor convinced Wheeler-Weaver to drive her back to her motel by telling him she’d left her cellphone there. When he did, she locked him out of the room and dialed 911.

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The Elizabeth Police Department later came under fire because they initially did not believe Taylor, who told the court officers seemed more interested in pinning her as a prostitute.

She still had a pair of handcuffs dangling from one wrist when officers arrived, reported.

“For someone to call an hour after the fact that they were kidnapped didn’t seem that it was emergent,” Elizabeth police Officer Billy Ly testified, according to the news site.

A week after Taylor’s near-death experience, Butler vanished.

Like West and Brown before her, Butler, a New Jersey City University student, was last seen with Wheeler-Weaver when she disappeared Nov. 22, 2016. According to the Record, Butler was home for the Thanksgiving break when she borrowed her mother’s van to “see a friend.”

Watch the North Jersey Record’s report on how Wheeler-Weaver was caught below.

She was not a sex worker, but she had met Wheeler-Weaver online. In previous conversations on the social media network Tagged, Wheeler-Weaver had offered her $500 for sex.

Butler had backed out of a previous meeting but on Nov. 22, she decided to go through with it.

“You’re not a serial killer, right?” she texted him.

Wells, the prosecutor, said Butler soon left her parents’ house.

“It was the last mistake she ever made,” Wells said, according to the Record.

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When Butler didn’t return the next day, her family became alarmed. Her mother, Lavern Butler, called her daughter’s friends, the hospital and the Montclair Police Department. No one knew where she was.

Her parents’ van was found abandoned in Orange, less than a mile from Wheeler-Weaver’s home, three days after she disappeared.

Butler’s body was found Dec. 1 at Eagle Rock Reservation, a conservation area in West Orange, buried beneath leaves and other debris. Like Brown, Butler’s body bore signs of strangulation with a piece of clothing, court records indicated.

Serial killer sentenced:

Aliyah Butler is comforted by her mother as she speaks in court Wednesday, Oct. 6, 2021, about her slain sister, Sarah Butler. Khalil Wheeler-Weaver, 25, of Orange, N.J., has been sentenced to 160 years in prison for the murders of Butler, 20, Robin West, 19, and Joanne Brown, 33, in 2016. He was also sentenced for the attempted murder, kidnapping and sexual assault of a fourth woman, who survived.

Butler’s sister, who knew the college student’s social media passwords, got together with a friend and went into her sister’s accounts, the Record reported. In her Tagged account, she found the interactions between Butler and Wheeler-Weaver.

The young women created a fake profile and worked with Montclair police investigators on arranging the sting operation.

Wheeler-Weaver was arrested for Butler’s murder Dec. 6, 2016. The charges in the other cases were added after cellphone records tied him to the locations where each slain woman was last seen, as well as where their bodies were found.

“Sarah’s friends and family are the heroes of this case,” Wells said at trial.