A 37-year-old man told police he put a stone in a sock and beat another man outside a Southeast Portland Plaid Pantry so severely that he thought the victim was dead, court documents say.

Surveillance footage from the store near

on Monday shows James L. Edwards Jr. hitting Kenneth W. Brummell with the loaded sock more than 10 times, mostly on the head, a probable cause affidavit said.

Emergency responders found Brummell lying in a puddle of blood outside the front of the store. He suffered broken eye sockets and bleeding in his brain, according to court documents. Doctors at OHSU Hospital had to put him into a medically induced coma, the affidavit said. He was listed in serious condition on Wednesday.

Police found Edwards about six blocks from the convenience store on the same day of the attack. He was trying to hide in a parking lot attendant booth, the affidavit said.

Edwards was arrested on suspicion of attempted murder and first-degree assault. He did not give police a reason for the alleged attack, and surveillance footage appeared to show Brummell not provoke the beating, according to the affidavit.

It is not clear from the affidavit if Edwards and Brummell knew each other. The document says Edwards made a slashing motion with his hand across his throat when authorities tried to interview him while booked at the Multnomah County Jail.

-- Everton Bailey Jr.

ebailey@oregonian.com

503-221-8343; @EvertonBailey