See also: Man Dies at HARD Summer Festival.

The L.A. County Department of Coroner this week identified the young man who died after attending the HARD Summer festival downtown as 21-year-old Jonathan M. Reyes of Los Angeles.

He “was found unresponsive, pulseless and non-breathing at the venue” about 10:30 p.m., an L.A. Fire Department spokeswoman told us. Although there was no indication he was revived, Reyes was officially pronounced dead at 10:57 p.m. at County+USC Medical Center, coroner's Assistant Chief Ed Winter told the Weekly:

“He was transported to the hospital from an apparent rave party,” Winter said.

The collapse and heart attack was witnessed by some at the Los Angeles State Historic Park festival. Performer Flying Lotus, who was scheduled to go on at 10:25 p.m., tweeted this:

You can hear a siren at the beginning of his set:

An autopsy was pending, Winter said. Toxicology tests usually take six to eight weeks to complete. A police official told us an overdose was suspected.

The two day party featured hip-hop (2 Chainz) and electronic dance music (Dog Blood, which features Skrillex & Boys Noize) and was sold out with a capacity of 70,000.

Live Nation, one of the nation's largest concert promoters, is behind the event. The company said its thoughts and prayers would go out to Reyes' family. It also stated:

Our guests' safety and well being is of paramount importance at every Live Nation event. We have skilled EMT's, police, and security staff deployed on site to respond to any emergency situation and last night members of this emergency team were with this patron and administering CPR within two minutes of notification. We work closely with local health and safety authorities to plan for emergencies and set the appropriate staffing levels for each event.

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