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Brittany Murphy, Simon Monjack

John Parra/Getty Images

The mystery surrounding Brittany Murphy's sudden death is deepening.

Hoping to clear up some lingering questions concerning toxicology tests, the Los Angeles County Coroner's Office paid another visit to the Clueless star's residence and conducted follow up interviews with her mother, Sharon Murphy, and husband, Simon Monjack.

"We were out there yesterday and interviewed her husband and mom in regards to trying to get some additional data for our investigation. They were very cooperative," Assistant Chief Coroner Ed Winter tells E! News. "[The investigation is] ongoing and we hope to close it soon."

In a previous sit-down, Sharon and Simon recounted for investigators their efforts to try and resuscitate the 32-year-old actress, who died Dec. 20 after collapsing in the bathroom of her Hollywood Hills home. They also shot down rumors that Murphy may have suffered from an eating disorder, insisting that she died of natural causes.

TMZ however quoted a source who worked at the Murphy residence as saying that Brittany had been receiving prescription medications in bottles delivered to her every Friday in a manilla envelope addressed to "Lola." The former employee also stated that those same meds were shipped from L.A. to Louisiana where Murphy was shooting a movie she ultimately was fired from in the months before she died and Monjack had been down there with her.

Consequently, the report stated that the pathologist was interested in knowing why there was no indication the thesp visited a doctor if she was feeling sick, including suffering from severe abdominal pain. However, Winter told E! News those questions didn't come up in the most recent line of inquiry.

As for the toxicology tests, which are expected to shed light on the cause of death, the coroner added that the results are due to be released any day now.

"As soon as the doctors know, we'll let everybody else know," Winters said.

Meanwhile, Monjack had hoped to hold a private fundraiser tonight at the Saban Theatre in Beverly Hills charging $1,000 per person to raise money for a memorial foundation in Brittany's name. But alas, those plans were scuttled at the last minute due to an unspecified illness. No word whether it'll be rescheduled.

According to its Website, the Brittany Murphy Foundation aims to "help keep Brittany's dreams alive to encourage and support arts programs to enrich the lives of children."

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Read about what Ted Casablanca has to say about Monjack's money troubles here.