Character actor and union activist David Graf, best known for his roles in the “Police Academy” movies, died Saturday of a heart attack at a wedding in Arizona. He was 50.

Graf was a member of the Screen Actors Guild’s national board as a Hollywood rep, the TV-theatrical steering committee, the new technologies caucus and the national disciplinary review committee. He also served as an alternate on the expanded national executive committee.

SAG prexy William Daniels said, “His kindness, generosity of spirit and ability to tirelessly work for the better of actors will be missed.”

Graf appeared in all seven “Police Academy” films as Eugene Tackleberry and had a recurring role as Col. Chase in TV’s “The West Wing.”

Other pic credits include “Rules of Engagement,” “Citizen Ruth,” “Guarding Tess,” “The Brady Bunch Movie” and “American Kickboxer 2.”

TV credits include “Highjacked: Flight 285,” “Father and Scout,” “Roseanne: An Unauthorized Biography” and “For Their Own Good.”

He is survived by his wife, Kathy, and two children.

Services will be held at 2 p.m. Friday at the First Christian Church in Studio City.