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Councilman O'Leary remains hospitalized. His injuries were so serious that he was admitted to the ICU on Sunday morning.
The attack was on the 11100 block of Washington Boulevard at Joxer Daly's, a pub in Culver City that O'Leary owns.
Police said O'Leary made the standard last call for drinks shortly before 2 a.m. Sunday.
Singerman apparently asked for another drink. O'Leary said he could not serve him anymore alcohol under California law.
"We believe Mr. Singerman may have wanted another drink near closing and was unable to be served and that kind of started the whole ball rolling on this," said Capt. Dave Tankenson, Culer City police.
Singerman allegedly started arguing with the owner, and O'Leary escorted him to the rear of the bar to get him out of the establishment.
Singerman allegedly punched the councilman, causing him to fall to the concrete floor.
Police said the suspect is a regular customer at the pub.
O'Leary's friends and colleagues said this is the first time he's ever had any problems at the pub.
"I know that 99 percent of the time, it is a place to have fun, and I'm sure that people will continue to go there and have fun in the future. We really wish Councilmember O'Leary well," said Martin Cole, Culver City assistant city manager.
However, others say there have been problems in the past with patrons getting out of hand.
Singerman is due in court for arraignment in October.
Anyone with information in the case is urged to call the Culver City Police Department at (310) 253-6202.