The New Jersey serial killer already serving 160 years in prison was linked through mobile phone data and location records to a fourth killing of a 15-year-old girl he met online and strangled in a vacant apartment behind a funeral home in 2016, according to investigators. Khalil A. Wheeler-Weaver strangled Mawa Doumbia in October 2016 after arranging to meet the Newark teen and taking her to “the second-floor of a decrepit carriage house” behind a funeral home in Orange, according to an affidavit filed by investigators in support of the new murder charge. Doumbia had been reported missing by …