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A retired Los Angeles police officer could spend three years behind bars after being charged with possession of child pornography, prosecutors announced Wednesday.

Clark Warren Baker, 61, was arrested and released on $20,000 bail  on April 10, about six months  after police searched his Hollywood Hills home and discovered an external hard drive that contained pornographic images of children, officials said.

LAPD employed Baker from 1980 to 2000, the agency previously told the Los Angeles Times. He was found guilty of beating up a Salvadoran immigrant while on duty in 1992, but an appeals panel later overturned that conviction, the paper reported at the time.

Baker appeared in court Wednesday for the child pornography charge and pleaded not guilty. He’s scheduled to return to court on May 13.

If convicted, he could face a maximum sentence of three years in state prison, according to the Los Angeles County District Attorney’s Office.

Authorities provided no further details about the case.