The 18-year-old from La Crescenta died at an off-campus home on Jan. 12 after attending a fraternity party the night before.
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The coroner's office said toxicology tests found no other substances besides alcohol in his system.
The Orange County Sheriff's Department Coroner Division said Domingo died around 3:30 a.m. of "accidental acute ethanol intoxication."
UCI student's death under investigation; frat suspended
The Irvine Police Department is continuing to investigate the case and will present its finding to the District Attorney's Office to determine if any charges should be filed.
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The Sigma Alpha Epsilon fraternity was placed on interim suspension following Domingo's death. He was a freshman and member of the frat.
He was a high-school athlete and registered as a biology major with plans to study kinesiology. His dream was to be a trainer for the NBA, according to his father.