AUSTIN, Texas - The Travis County District Attorney's office has dismissed an assault charge against a man accused of running over slain Caldwell County deputy constable Aaron Armstrong's arm in January.

22-year-old Ronaldo Ernesto Colindres-Simon was charged with second-degree felony assault on a peace officer, but those charges were dismissed in April, with the DA citing "insufficient evidence - request of law enforcement" as the reason.

Dig deeper: Colindres-Simon was one of two people charged in connection with Armstrong's death; the other is 38-year-old Thomas Vences.