Orazio Petito was misidentified as frat president at the time of the incident.
Authorities allege that the drug business was passed down through the fraternity, handed off by brothers who were graduating or studying abroad.
The parents of a 19-year-old UC Berkeley student who died after drowning at a fraternity party last month are now suing the frat for wrongful death.
Police say when Berkeley Fire arrived on scene, they found a large party underway with more than 300 people in attendance and "heavy alcohol consumption."
The 19-year-old student's name wasn't released nor were the circumstances that led to their injuries.
A Bay Area teen drowned over the weekend while on a trip with his fraternity brothers at Lake Havasu, according to multiple reports.