Quinn collapsed on the street where he lived in Malibu while walking home from a nearby store with one of his sons, said Lt. James Royal of the Los Angeles County Sheriff's Department's Malibu/Lost Hills station. He was pronounced dead at Santa Monica-UCLA Medical Center. Quinn's agent, Arlene Thornton, said in a statement that the cause had not been determined but that he was believed to have suffered a heart attack.
Francesco Quinn's ancestry — Anthony was of Mexican-Irish descent — allowed him to portray a range of characters.
After playing the drug-dealing soldier Rhah in "Platoon," Oliver Stone's 1986 Vietnam War drama that won the Academy Award for best picture, Quinn appeared in more than a dozen films. In "The Tonto Woman," a Western based on an Elmore Leonard story that became a 2008 Academy Award nominee for best live-action short, he played a Mexican gunslinger.
On television, he had recurring roles in prime time series, including "JAG," "24" and "The Shield," and from 1999 to 2001, he played writer Tomas del Cerro on the soap opera "The Young and the Restless." He also played the young Santiago in a TV movie version of Ernest Hemingway's "The Old Man and the Sea" that starred his father as the title character.
Quinn's survivors include his wife, Valentina Castellani-Quinn, and three children. He was previously married to Julie McCann.
His father died at 86 in 2001.
Times staff writer Tony Barboza contributed to this report.