HALF MOON BAY -- The 67-year-old gunman who went on a killing spree in Half Moon Bay had legally purchased his firearm, had no prior contact with local law enforcement and was an employee of one of farms he targeted.

At a Tuesday morning news conference, San Mateo County Sheriff Christina Corpus said among the victims of Half Moon Bay resident Chunli Zhao were seven men and a woman. She did not identify the gender of the surviving victim who was in critical condition at Stanford Medical Center.

Officials said Zhao was an employee at the Mountain Mushroom Farm. They were still trying to determine why he went to a second farm and killed three others.

Corpus said that the only known connection between the shooter and his victims is that "they may have been coworkers."

"All the evidence we have points to this being workplace violence," Corpus told reporters. "The Mountain Mushroom Farm, the first location, was where the suspect was employed."

Corpus said the coroner's office was facing a difficult challenge of notifying the families of the seven workers who were killed because many were migrants.

Zhao was set to be arraigned on charges related to the shooting at 1:30 p.m. Wednesday.

The incident began with San Mateo County Sheriff's deputies being dispatched at 2:22 p.m. to the Mountain Mushroom Farm on San Mateo Road near Highway 1 in unincorporated San Mateo County on a report of a shooting with multiple victims.

Upon arrival, deputies located four victims deceased with...

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