Police noticed he smelled of alcohol after pulling him over for speeding. He admitted to having consumed three beers and taking a shot of some type of alcohol.
He was tested and his blood alcohol level was .107.
The site, which looked at the police report, revealed the arresting officer also discovered a joint in a cigarette box.
Seth played a police officer on The Wire. He has also starred in Courage Under Fire (1996), Starship Troopers (1997) and Did You Hear About The Morgans? (2009).
His latest film Police State - in which he plays Officer Grady opposite Sean Young and Neal Bledsoe - is in post production.
Seth Gilliam in a scene fom The Walking Dead. Photo / AMC
His arrest comes just two days after Chad L. Coleman - who worked with Seth on The Wire and The Walking Dead - ranted on a New York subway.