WOODBURY, N.J.—A man who is accused of killing a New Jersey man he says sexually abused him in childhood, and who is considered a person of interest in the deaths of his ex-wife and three others in New Mexico, told investigators he is responsible for a total of 16 slayings, prosecutors say. Sean Lannon, 47, said he was responsible for the killings in New Jersey and New Mexico—that he had killed his wife and others, including “11 other individuals,” NJ.com quoted Alec Gutierrez, an assistant prosecutor in suburban Philadelphia’s Gloucester County, New Jersey, as saying during a detention hearing Friday. “He admitted to killing a total of 16 people … 15 being in New Mexico and one in the state of New Jersey. It’s my understanding that the FBI is assisting New Mexico in their investigation,” Gutierrez said. Authorities allege in court documents that the admission came in a phone …