Former radio sports personality Bill Powers and his wife were stabbed to death, according to autopsy results released Friday.
Their bodies were found Thursday morning inside their southwest Braeside home.
Derek Puffer, 35, has been charged with two counts of second-degree murder. He is the son of Powers' wife, Donna Lee.
Puffer has been ordered to see a doctor and officials say there may be mental health concerns based on his demeanour and interactions with police.
He is stepson to Bill Powers, who retired in October 2009 after almost 50 years in the sports broadcasting and communications business.
Staff Sgt. Grant Miller says Puffer was living with the Powers at the time of their deaths.
Couple stabbed in bed
Police say they don't believe drugs or alcohol were factors in the couple's death.
"So the why in this is truly is the big question," Miller said. "It absolutely is what our investigation is focused on."
Investigators said a knife was found outside the home on the 1700 block of 110th Avenue S.W.
Officers were alerted to the incident after a passerby called police about a naked man on the street near Southland Drive and 14th Street S.W.
The man directed police to a house nearby where the bodies were found in their bed."We've spoken with him and as a result of speaking with him, he is now charged with two counts of second-degree murder," Miller said.