A young man severely burned in a has died, officials said.
William Calabrese, 20, was pronounced dead at 8:10 a.m. Sunday at Arrowhead Regional Medical Center, according to the Riverside County Coroner's office.
His aunt, Kristina Calabrese Stracke, informed Patch of her nephew's passing and Patch confirmed it with a coroner investigator.
"My nephew was the young man that was life-flighted from the fireworks explosion at Lake Elsinore Storm stadium," Calabrese wrote Patch in an email.
"Sadly, he passed away this morning at 8:10 a.m. as a result of the injuries he sustained from the accident.
"He was a wonderful young man with a bright future, studying at UC Santa Barbara. He died doing what he loved - working with fireworks."
According to Calabrese, her nephew graduated from La Jolla High School and was an Eagle Scout from La Jolla Troop 506.
He was on summer break, working a job with Fireworks America, his aunt told Patch.
"He was such a good young man and so full of life," Calabrese said.
The coroner's office confirmed that the young man lived in San Diego.
An examination of his remains will be conducted Tuesday, the coroner investigator said.
Condition reports on two others injured that night -- one of them a firefighter -- were unavailable Sunday afternoon.
To read more about the explosion, which is still under investigation, please click here.