According to the New York Post actress Brittany Murphy may have been exposed to tainted drugs at the time of her death. A source told Page Six that around the time of her death in 2009, meth and cocaine laced with toxins like rat poison was popular in Los Angeles.

Originally the coroner said Murphy's death was due to "natural causes" from anemia and pneumonia but a new toxicology report ordered by her father found high levels of toxins in her hair. The new report said Murphy had not died from "natural causes" but "possible poisoning by a third party perpetrator with likely criminal intent."

"The actress may not have been poisoned as her father suspects but in fact may have exposed herself to drugs that had mixed with chemicals like rat poison," Page Six writes.

This isn't the first time rumors of drugs have surrounded Murphy and her death but her father, Angelo Bertolotti, believes the actress was not using any drugs.

"Vicious rumors, spread by tabloids, unfairly smeared Brittany's reputation," he said in an interview. "My daughter was neither anorexic not a drug junkie. I will not rest until the truth about these tragic events is told. There will be justice for Brittany."  

The "Clueless" star was found dead in her home by her mother in December 2009. Her mother and husband were immediately suspicious about the death. Five months later, Murphy's husband, Simon Monjack, was also found dead in the home from the same causes.

Now, four years after her death Murphy's father is launching his own investigation. According to the Daily Mail, Bertolotti believes his daughter and her husband were being surveillance and threatened by "government spooks and was poisoned" in revenge of backing a whistleblower.

Reportedly around the time of her death her father claims Murphy and her husband were giving celebrity backing to Julia Davis, a Department of Homeland Security whistleblower. Davis made public claims that the U.S. knew terrorists were crossing the Mexican border. At the time she said she was working as a border security guard in California and was branded a "domestic terrorist" after she went public with her claims.

"She was under surveillance from shadowy government operators who wiretapped her phone and terrorized her after she spoke out in support of [Davis]," her father said.