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.

Michael Madsen, who was found unresponsive in his Malibu home on July 3, died from heart failure, with heart disease and alcoholism as contributing factors, his rep said.

Michael Madsen's death at age 67 was caused by heart failure, the actor's cardiologist tells NBC Los Angeles. The frequent Quentin Tarantino collaborator was found unresponsive at his Malibu home last week and he was pronounced dead there.