Robert Evan Sarkkinen, 56, was last seen at his home north of Lewisville Park in Battleground, Washington on May 13, 2018. He lived on a rural property and had mental disabilities with a known history of wandering, which investigators say makes that behavior a likely factor in his disappearance.

Search and rescue teams began sweeping the property and surrounding woods immediately. Searchers found several of Robert’s personal items along a trail — clothing, an adult diaper, his wallet and his cell phone — but no sign of him. Despite continued searches through dense terrain, he has not been located and the Clark County Sheriff’s Office lists the case as active under case number 18004480. Investigators do not suspect foul play.

The family has offered a $5,000 reward for information that could lead to his whereabouts. Can anyone who knew Robert, his routines, or the area north of Lewisville Park share information with the Clark County Sheriff’s Office Major Crimes Unit Tip Line?