From the BBC:
Andy Hallett, a singer who gained fame portraying a green-skinned demon on the cult US TV series Angel, has died of congestive heart disease aged 33.
Hallett was taken to Cedars-Sinai Medical Center in Los Angeles after having problems breathing and died there on Sunday, his agent said.
It follows a five-year battle with the heart condition.
The star appeared on more than 70 episodes of the Buffy the Vampire Slayer spinoff between 2000 and 2004.
Condolences to his family and friends.