Ronald LeRoy Zellmer, 31, was last seen April 6, 1985, in Sioux City, Iowa. His 1984 Chevrolet Cavalier was found abandoned with the engine running on the south end of the Veterans Memorial Bridge in South Sioux City, Nebraska, at about 5:50 a.m. His apartment at 1003 Pierce Street was reported empty and showed no signs of disturbance.

Zellmer had a history of long-term depression, and investigators considered suicide as a possibility, but his body was never recovered despite searches of the Missouri River. The case has been handled as an endangered missing person matter, and family members said he had been experiencing significant emotional distress before he disappeared. The circumstances of the abandoned vehicle have also left room for questions about possible foul play.

No conclusive evidence has emerged to determine his fate. Does anyone have information that could help resolve what happened to Ronald Zellmer?