Hallett passed away at Cedars-Sinai Hospital with his father by his side after a five-year battle with heart disease, his agent Pat Brady confirmed to E!Online.
A private funeral is planned in the actor’s hometown of Cape Cod later in the week.
Rumor has it that ‘Buffy’ creator Joss Whedon came across Hallett singing at a nightclub where Whedon was struck with the idea for “Lorne.” Whedon then asked Hallett to audition for the part and, the rest, as they say, is history. He then became a series regular near the end of the fourth season and has two songs (“Lady Marmalade” and “It’s Not Easy Being Green”) on the Angel: Live Fast, Die Never soundtrack, released in 2005.
Hallett costarred on ‘Angel,’ a spinoff of ‘Buffy, the Vampire Slayer,’ from 2000 to 2004.