A man arrested on suspicion of driving under the influence in Riverside over the weekend died after he was taken into custody and transported to a hospital for treatment of drug intoxication, prompting an investigation to determine whether patrol officers did anything wrong, authorities said Friday.

Jose Luis Serrano, 32, of Riverside succumbed to the apparent overdose in the predawn hours Sunday, according to the Riverside Police Department.

“Detectives assigned to our Robbery-Homicide Unit, along with investigators from the Riverside County Sheriff’s Department’s Force Investigations Detail (have) assumed the investigation,” police spokesman Officer Ryan Railsback said.

An autopsy on Serrano was pending Friday.

Railsback said shortly after 8 p.m. Saturday, the motorist allegedly ran

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