People.com Crime Sex Offender Is 'Person of Interest' in Missing Boy Mark Himebaugh's 1991 Disappearance Himebaugh vanished after leaving his Middle Township home to watch firefighters put out a blaze in 1991 By Tara Fowler Published on June 10, 2015 02:50 PM Share Tweet Pin Email Photo: Middle Township Police Middle Township, New Jersey, police have released a sketch of a “person of interest” in the disappearance of Mark Himebaugh, who was just 11 when he vanished in 1991. The sketch appears to resemble Thomas Butcavage Jr., who has been on cops’ radar since 1993 in connection with a particular case. “He was a person of interest and continues to be one,” Middle Township Police Chief Christopher Leusner told NJ.com. Himebaugh vanished after leaving his Middle Township home to watch firefighters put out a blaze in 1991. The only clue ever found in the boy’s disappearance was a single shoe discovered on Delaware Bay beach. Police recently released the audio from a 2010 tip call in an effort to identify the anonymous tipster, who simply refers to himself as “the son of the witness” to the then 11-year-old’s disappearance. In the call, the man in question identified the name of a potential suspect: Gilbert Patrick Marie. Though police investigated the tip, they were unable to find any connections to the case for a person with that name. So authorities made the call available to the public with the hopes of gleaning new information about the 24-year-old disappearance. Butcavage, who is currently in prison for various underage sex convictions, was first linked to the case after a male prostitute said that Butcavage had shown him a video in which he was sexually assaulting a young boy who looked like Himebaugh. Want to keep up with the latest crime coverage? Click here to get breaking crime news, ongoing trial coverage and details of intriguing unsolved cases in the True Crime Newsletter.