Brittany Murphy's widower is suing Warner Brothers over her tragic death.

Simon Monjack alleges the studio is to blame for Brittany dying last month from a cardiac arrest because just two weeks before her passing they fired her from the sequel to hit animation 'Happy Feet'.

He said: "They killed her. She was devastated... You're disposable as an actress or actor.

"I am tough. I litigate when somebody does something wrong to me. That's one of the reasons I make enemies."

Simon also claims his late wife - who was just 32 when she died on December 20 2009 at her Los Angeles home - lost out on many roles because of rumours she was a drug user, even though she never touched illegal substances.

The screenwriter - who married Brittany in May 2007 - said in an interview with website The Daily Beast: "In all the time I've known her, she has never, and I repeat never, done drugs. Not a line of cocaine, not a hit from a joint, nothing. She was anti-drugs. There are no drugs involved. The drug rumours made her lose roles, I'm sure. All she wanted to do was to make movies. She was waiting for the role that would revive her career, waiting for the call from Penny Marshall or Guy Fleder, people she had worked with before, that they might remember how talented an actress she was. There's always some new girl getting off a bus. In Hollywood, girls like Brittany are disposable."

The screenwriter also denied claims he ruined her career, saying her Hollywood star was dimming before he met her.

Simon believes the film industry is full of people who use young actresses and actors.

He said: "Brittany's films had grossed $100 million before she met me. But her career had ended before then. She had gone through four or five agents by the time we met, and she had made a lot of indies that went straight to video. She hadn't earned millions in years, and when we met she was struggling financially, from a series of bad investments. She trusted some people who she shouldn't have. There are people in Hollywood living off of young successful boys and girls and getting them to invest in things they shouldn't."