A Montana man accused of killing a 15-year-old girl in 1996 died by suicide last month, a day after police questioned him about the teens cold case, the Gallatin County Sheriffs Office announced Thursday.

Paul Hutchinson, 55, was questioned by authorities July 23, after DNA evidence collected in Danielle Danni Houchins death made him a suspect.

Houchins was last seen leaving her home on Sept. 21, 1996, at around 11 a.m. and was reported missing by her family after failing to return. Her mother found the teens truck later that night at the Cameron Bridge Fishing Access Site on the Gallatin River.