Two teens arrested in connection with San Mateo homicide

SAN MATEO – Two 16-year-old boys have been arrested in connection with a fatal shooting in San Mateo, authorities said.

The shooting stemmed from a confrontation at the San Mateo Adult School at 789 East Poplar Ave. just before 9 p.m. Friday. Officers arrived to find a 19-year-old man in the driver’s seat of a parked vehicle suffering from a gunshot wound to his chest.

The victim was taken to a trauma center, where he died of his injuries. He was identified as Daly City resident Ashly Tianson, according to the San Mateo County Coroner’s Office.

One suspect was arrested in San Jose on Saturday and the other was arrested in San Mateo on Monday, the San Mateo Police Department said in a news release. The boys were booked into Hillcrest Juvenile Hall in San Mateo on charges of murder, attempted murder and conspiracy.

Detectives also served search warrants at residences in Menlo Park and San Mateo.

“Evidence collected as a result of these search warrants is being analyzed and processed,” police said.

Police said the shooting was an “isolated incident” and not connected to any event or activity at the school.

Anyone with information or footage related to the shooting to contact Detective Sgt. Kurt Rodenspiel at 650-522-7662 or Anonymous tips can be submitted at 650-522-7676 or

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Author: Jason Green