Michael Madsen, a prolific character actor best known for his frequent appearances in Quentin Tarantino films, died Thursday morning. The cause of death, his manager said (per NBC News), was cardiac arrest. He was 67.

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, the 'Reservoir Dogs' actor who worked often with Quentin Tarantino, died at his Malibu home of cardiac arrest, a representative says. He was 67.