A felony charge of accessory to a crime has been dropped against the onetime girlfriend of a former Riverside County sheriff’s deputy who is on trial for murder — prosecutors say he killed a romantic rival but claimed he shot him in self-defense during an arrest.

The District Attorney’s Office declined to explain why it filed the motion to dismiss the lone count against Diana Perez.

She may be asked to testify, said Amy McKenzie, a spokeswoman for the DA’s Office: “Aside from calling her as a witness, we are unable to comment at this time.”

Testimony is continuing this week at the Larson Justice Center in Indio.

Oscar Rodriguez, 44, is charged with first-degree murder for the 2014 slaying of Luis Carlos Morin, 39, of Coachella. At the time, Rodriguez was romantically involved with Per

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