MADISON, Wis. (AP) -- The state Justice Department has released new documents confirming an off-duty deputy who killed six people shot himself as he fled police last fall.

Forest County Sheriff's Deputy Tyler Peterson gunned down six people with an assault rifle at a Crandon party last October.

Investigators say he shot himself in the head three times in the woods hours later as police closed in. Questions have swirled about how Peterson could have shot himself three times.

The Justice Department released a summary Thursday of Peterson's autopsy that showed only one of the shots damaged Peterson's brain. Soot rings were found around the entrance wounds, suggesting the shots were fired at close range.