His role as Lt. Daniels on the Wire as well as his recurring horror character AHS Haitain Vodou god of the afterlife, Papa Legba, were probably his two most well-known movie/TV characters.
His supporting role as Charon in the John Wick films were really memorable, too.
He even did a great job portraying a Naval Adm. court-martial head in a recent, posthumous performance in the Caine Mutiny Court Martial HBO special, a 2023 remake of Humphrey Bogart's famous Caine Mutiny.