Kaiser Permanente employee arrested in connection with sexual assault

- Police in Union City have arrested a Kaiser Permanente medical assistant in connection with a sexual assault incident that was reported last month, police said Friday.

The suspect was arrested Friday morning. Officers arrested 47-year-old Hayward resident Efrain Castanon on suspicion of sexual assault, Lt. Jeff Snell said.

On Jan. 25, a woman reported a medical assistant sexually assaulted her when the victim went to a Kaiser Permanente medical office in Union City, police said.

The ensuing investigation lead to the positive identification and arrest of the suspect, police said.

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