Ernie is a regular barfly at Paddy's until season 5.
Ernie is played by David Zdunchi.
Ernie can be seen in the background of many episodes, and up close in episodes ""Sweet Dee's Dating a Retarded Person" and "Paddy's Pub: The Worst Bar in Philadelphia". He died and had an episode dedicated to him. Paddy's Pub: Home of the Original Kitten Mittens.