A woman and Peter Selis, 49, were killed after the latter critically injured adults attending a birthday party at the La Jolla Crossroads apartments swimming pool on Sunday night, CNN quoted police chief Shelley Zimmerman as saying.
The gunman appeared to be reloading his large-caliber handgun when three officers arrived at the scene and shot him dead.
It was unclear how many people were at the pool at the time of the shooting.
It was earlier reported that eight persons were shot but the figure was later revised to seven.
Police believe the gunman and at least one of the partygoers lived at the apartment complex.
"We don't know if he knew any of the victims," Zimmerman said.
According to the Los Angeles Times, a resident said he was in his apartment when he heard gunshots followed by yelling and screams. He ran to his building's clubhouse where he could see the pool.
He said the shooter seemed at ease, while bloodied victims struggled.
"He had his beer in one hand and his gun in the other," said the witness.
Zimmerman said it was unclear what motivated the shooting.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
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