Andy Hallet who portrays Lorne in the vampire TV series, "Angel." Photo by AP.
Hallett's agent Pat Brady says Hallett died Sunday at Cedars-Sinai Medical Center in Los Angeles after having problems breathing. Brady says he has battled the heart condition for the past five years.
Hallett was a fan favorite on the Buffy the Vampire Slayer spinoff as Lorne, a green-skinned good guy demon who runs a karaoke club and can read a person's aura when they sing.
The show ran five seasons on the WB network and ended in 2004.
Hallett, an only child, is survived by his father Dave Hallett and mother Lori Hallett.
