Authorities in Las Vegas have confirmed a man who died at the 2014 Electric Daisy Carnival passed away after suffering an ecstasy overdose. California resident Montgomery Tsang, 24, collapsed in the parking lot upon leaving the annual music event in June (14) and was pronounced dead at a local hospital. On Wednesday (09Jul14), Clark County coroner's officials ruled his death an accident, noting Tsang overdosed on the popular club drug. A pre-existing heart condition was also a factor in his death, according to Billboard.com. Tsang was just one of three EDC concertgoers who lost their lives at the festival, but the cause of their deaths has yet to be determined. At this year's (14) event, nearly 800 revellers were treated for medical conditions, and 25 were admitted to local hospitals. Several dozen were also arrested by police on drug charges. This isn't the first time tragedy has overshadowed the festival. In 2012, organisers distanced themselves from two deaths which occurred after revellers attended the event.