Michael Madsen, a frequent Quentin Tarantino collaborator on films like "Reservoir Dogs" and a veteran actor in "Free Willy" and more, has died at 67.

Actor Michael Madsen, known for his roles in "Reservoir Dogs" and "Kill Bill," has died at the age of 67. Madsen's death was confirmed Thursday by his publicist, Liz Rodriguez. Madsen was found unresponsive Thursday morning at his home in Malibu, California, and is believed to have died due to cardiac arrest, Rodriguez told ABC News.

Actor Michael Madsen, a stoic actor who worked with Quentin Tarantino among other directors in various acclaimed films from the 1980s onward, has died, according to his publicist Liz Rodriguez. He was 67.