Labbe was last seen on August 8, 1974, on Andover Street in Lawrence, Massachusetts. She had visited her family and decided to hitchhike home to Lowell, Massachusetts, where she lived in an apartment with her boyfriend. She apparently never arrived in Lowell and has never been heard from again. She was carrying a black suede handbag at the time she went missing. Labbe is described as a shy teenager. Her father stated that although she was not a good student, she did not get into trouble with school officials or the law. At the time of her disappearance, was employed at Paris Shoe in Lowell. Her loved ones believe she was murdered, but few details are available in her case.