WICHITA, Kan. (AP) -- Police in Wichita are seeking a motive in the city's fourth homicide of the year.

A relative found the body of 38-year-old Michael Salyer in his downtown apartment Monday afternoon, more than 16 hours after neighbors last saw him alive. The Wichita Eagle reports (http://bit.ly/wcKbIg ) that an autopsy Tuesday showed Salyer had been stabbed to death. He also had severe head trauma.

Wichita police Lt. Ken Landwehr says there were signs of a brief struggle, but robbery doesn't appear to be a motive. No drugs or paraphernalia were found in the apartment, and Salyer's wallet, keys and other valuables were also left behind.

Investigators had no suspect as of Tuesday night.