The Kennewick man who barged into a Pasco home early Friday died from a single gunshot wound to the chest.
The autopsy on Travis F. Yeates, 34, was performed Saturday by Dr. Sig Menchel, a forensic pathologist from Bellevue.
Franklin County Coroner Dan Blasdel said toxicology will be sent to a lab, with results expected in six to eight weeks.
Yeates was killed about 2:30 a.m. when he reportedly forced his way into a home on Austin Drive, just off Burden Boulevard, investigators have said.
Homeowner Corey Chapman called 911 to report a man pounding on his front door. As officers arrived, Chapman told dispatchers the man was inside his home. Police then heard a gunshot and found Yeates dead inside.
Investigators are trying to determine whether Chapman was justified in shooting Yeates, who worked as a safety and health specialist at the Hanford tank farm contractor, Washington River Protection Solutions.