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 invesigators paid another visit to the Clueless star's residence Wednesday to conduct follow-up interviews with her mother, Sharon, 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.
The family also shot down rumors that Murphy may have suffered from an eating disorder or drug abuse, 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 every Friday in a manila 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 accompanied by Monjack. She ultimately was fired from the film in the months before she died.
However, Winter tells E! News questions about the mailings 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 time 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 those plans were scuttled earlier this week 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."
Read what Ted Casablanca has to say about Monjack's money troubles here.