Pierce County man killed by son in gruesome attack has been identified BY STACIA GLENN JUNE 07, 2021 02:53 PM , UPDATED JUNE 07, 2021 03:00 PM Play Video Duration 1:53 Son fatally stabs parents at their home near Bonney Lake, says Sheriff's Department Pierce County sheriff’s deputies work the scene of a double homicide on 171st Ave. Ct. E. near Bonney Lake on Sunday, May 30. A 29-year-old man was arrested after he reportedly stabbed and killed his parents. BY DREW PERINE A Sumner man believed to be killed by his son in a gruesome attack involving six different weapons has been identified. Mark Steven Rorvik, 59, died May 30 of multiple blunt impact and sharp force injuries, according to the Pierce County Medical Examiner’s Office. His 61-year-old wife, who was also killed, has not been publicly identified. Their son, 29-year-old Zachary Rorvik, has pleaded not guilty to two counts of aggravated first-degree murder and is being held without bail. The younger Rorvik might hav