The official trailer for What Happened, Brittany Murphy? has been released.

The HBO Max documentary will explore the final days of the Clueless actor’s life before her sudden death at the age of 32.

Murphy has been the focus of many rumours and conspiracy theories in the 12 years since her death.

Initially cited as ‘natural causes’, her cause of death was later listed as pneumonia, with additional anaemia and prescription drug intoxication.

Murphy’s mother Sharon and husband Simon Monjack initially claimed her death was caused by a heart condition.

Some theories claimed Monjack was sleeping with her mother, and others even claimed Murphy’s mother murdered her.

Months later, Monjack was found dead in the same home.

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A coroner ruled his death was also caused by pneumonia and severe anaemia.

Murphy’s mother then claimed toxic mould killed both her daughter and son-in-law.

The Los Angeles County Department of Health entertained the idea, but it was outwardly rejected by the coroner.

What Happened, Brittany Murphy? brings the focus back to Monjack, interviewing his mother, brother, and former fiance, Elizabeth Ragsdale.

Ragsdale claimed Monjack lied to her about who he was, and left her “pregnant and abandoned”.

“He was a disturbed individual who was used to conning people and Brittany was one of his last victims,” film director Cynthia Hill said of Monjack.

“There was a pattern of behaviour that became very obvious the more research that we did.”

The documentary also interviews makeup artist Trista Jordan, who worked on Murphy’s final film, Something Wicked.

“Her eyes were so sunken, and she just seemed so sad,” Jordan said of Murphy’s appearance in her final months.

“She wasn’t herself. She was in so much pain. She had Bambi legs and couldn’t stand up.”

Watch the official trailer for ‘What Happened, Brittany Murphy?’ here: