Richard Lesann had been charged in the death of Tammy Kulaway whose body was found on a property near Springside, northwest of Yorkton.
RCMP had first been called about a possible stabbing.
Lesann was tracked down a short time later and arrested.
On Tuesday, Lesann was found not criminally responsible in the death due to a mental disorder.
Mounties say Lesann and Kulaway knew each other.