Robert Altman, the caustic and irreverent satirist behind "M*A*S*H," "Nashville" and "The Player" who made a career out of bucking Hollywood management and story conventions, died at a Los Angeles Hospital, his Sandcastle 5 Productions Company said Tuesday. He was 81.

The director died Monday night, Joshua Astrachan, a producer at Altman's Sandcastle 5 Productions in New York City, told The Associated Press.

The cause of death wasn't disclosed. A news release was expected later in the day, Astrachan said.

A five-time Academy Award nominee for best director, most recently for 2001's "Gosford Park," he finally won a lifetime achievement Oscar in 2006.

"No other filmmaker has gotten a better shake than I have," Altman said while accepting the award. "I'm very fortunate in my career. I've never had to direct a film I didn't choose or develop. My love for filmmaking has given me an entree to the world and to the human condition."

Altman had one of the most distinctive styles among modern filmmakers. He often employed huge ensemble casts, encouraged improvisation and overlapping dialogue and filmed scenes in long tracking shots that would flit from character to character.

Altman's passing is a huge loss to the world of cinema. He had maintained a consistently high level of accomplishment as a director and scriptwriter for almost 60 years.