Search in Seattle for Michael Boysen after grandparents found dead SEATTLE, March 11 (UPI) -- A Seattle-area man wanted in connection with the death of his grandparents is a danger to police and the public, sheriff's detectives said. The grandparents of Michael Boysen, 26, were found dead in their Renton, Wash., home Saturday, two days after his completion of a 9-month prison sentence for breaking into a home, and a warrant was issued for his arrest in connection with the deaths, the Seattle Times reported Monday. They were last seen alive at a welcome-home party for Boysen in their home, seattlepi.com reported. The King County Medical Examiner's Office has not released the victims' names and investigators have not said how the couple, ages 82 and 80, died, other to say the deaths are being investigated as homicides. Boysen had made threats against law enforcement officers in the past and is attempting to obtain weapons to kill citizens, corrections officers and police, King County, Wash., Sheriff John Urquhart said Monday afternoon. Detectives learned from a search of computer data Boysen researched gun shows in Nevada and Washington state either just before or just after his grandparents were killed, Police Sgt. Cindi West said.