By Christine Spines
Updated March 31, 2009 at 05:35 AM EDT

Actor and musician Andy Hallett died on Sunday night at Cedars-Sinai hospital in Los Angeles. He was 33 and had endured a five-year battle with congestive heart disease. Hallett was best known as Lorne, the friendly demon who reads people when they open up at the karaoke mic, on the TV series Angel. It was a role that show creator Joss Whedon wrote specifically for Hallett, after Whedon saw the entertainer performing the blues at a Los Angeles nightclub.

In 2004, just as Angel‘s run was ending, Hallett saw a doctor after suffering debilitating fatigue and learned that he had the degenerative disease. Too tired to take on acting work, he shifted back to singing occasionally around town and attending fan conventions when he could. He is survived by his father, Dave Hallett, who was at his bedside and will hold the funeral near his home in Cape Cod, Mass.