Authorities conducted an autopsy Monday for a man who was killed in an apparent hunting accident on private property between Valley Ford and Tomales, Marin County coroner's officials said.

Richard William Weller, 58, of Martinez had spent Saturday morning hunting with a group of people, Assistant Chief Deputy Coroner Lt. Keith Boyd said.

The group was in a vehicle at a Middle Road property just south of Valley Ford when a firearm discharged, possibly when it fell from a rack, Boyd said.

The Marin County Sheriff's Office was notified of the shooting at 12:28 p.m. Saturday. Weller was pronounced dead at 1:16 p.m., Boyd said.

Officers with the Marin County sheriff's investigations and coroner's units as well as the state Fish and Wildlife Department were investigating Weller's death, Boyd said.

No more details were immediately available.