BERKELEY, Calif. — A 22-year old man who died after plummeting about 30 feet from the roof of a University of California, Berkeley fraternity house last week had been found alive after his fall, but the people who discovered him didn’t know he’d fallen and didn’t call for an ambulance, his sister said late Tuesday.

Instead, thinking he was just drunk during a Christmas party, they helped him inside, where he lay down. The next morning he was dead.

Jeff Engler was alone when he fell sometime Friday night, Caity Engler told The Oakland Tribune. While some people attending a party at the Pi Kappa Phi house knew he’d gone to the roof, those who found him on the ground didn’t know what had happened, she said. “There was a disconnect.”

Sharing information she said Berkeley Police provided her family, Caity Engler said her brother was conscious and spoke with friends after his fall.

Police were called at about 7 a.m. Saturday, but Jeff Engler was dead when they arrived. Jeff Engler was a fraternity member but didn’t live at the house and had not attended classes at Berkeley since 2012. “The roof was one of his favorite places,” Caity Engler said. “He’d go up there to write or play his guitar.”

Her brother “was with people he loved, at a place he loved. Unfortunately on this night, all that love involved too much alcohol. And a roof.”

A Berkeley Police spokesman Tuesday evening declined to comment on Caity Engler’s version of events and only said they were still investigating.

There was no answer to repeated phone calls to the fraternity house Tuesday.

A spokesman for Pi Kappa Phi’s national office said before Caity Engler’s statement, that members of the Berkeley house had been urged to fully cooperate with the police investigation.

Jeff Engler’s death was the third attributed to alcohol in the past 13 months in a neighborhood near Cal’s Memorial Stadium, dominated by fraternity and sorority houses.

“We are investigating the incident and awaiting autopsy results,” Robert Sanders, a university spokesman, said Tuesday. He was not immediately certain where the school’s probe could lead. “Obviously, much depends on the cause of death.”