Tom Warnick, the 22-year-old professional urban-park skier found dead in his Boulder apartment last month, died of a heroin overdose, according to a formal ruling by Boulder County Coroner Emma Hall released today.

After an autopsy and further investigation, Hall ruled that Warnick's death was accidental due to "acute heroin intoxication."

Warnick, who was from Frisco but was a junior at the University of Colorado studying journalism, was found dead early Nov. 4 in his apartment in the 2900 block of East Aurora Avenue.

Warnick was a professional urban-park skier, according to friends who regularly filmed ski videos with him as part of Boulder's Stept Productions.

Alex Martini, co-owner of Stept who counted Warnick as a friend for the past decade, told the Camera last month that the tight-knit Stept crew and family were devastated but coping with "epic memories."