Brittany Murphy's mother claims toxic mold found in Brittany's swanky Hollywood home killed her daughter AND her son-in-law ... and now she wants someone to pay.

Brittany died from pneumonia in 2009 ... and five months later, her husband also passed away from the same ailment.

Sharon Murphy claims the people who built the house are to blame for the mold that caused their condition -- but according to a new lawsuit, Sharon alleges she was duped by her lawyers into giving up her rights to sue the builders for wrongful death.

Long story short -- Sharon says her lawyers convinced her to accept a settlement offer for the construction defects back in January ... but they failed to explain she would never be able to go after the builders for their alleged role in Brittany's death.

Now, Sharon has hired Michael Marzban to sue her former lawyers for legal malpractice -- and wants them to pay her what she could have won in a wrongful death suit ... and other damages.

Brittany Murphy would have been 33-years-old today -- and to honor her memory, the actress' mother has decided to write a book on her life ... TMZ has learned.


In a statement through her rep, Sharon Murphy tells us, "This book will be my way of celebrating and honoring her extraordinary life and career."

Sharon insists the biography will be an "accurate account about my daughter, her life, loves, and career."

Murphy claims a portion of her profits from the book will be donated to charity. So far, no release date has been set.

Sharon Murphy is lashing out at the L.A. County Coroner's report on Simon Monjack's death -- especially the part that references her sharing a bed with Simon.


TMZ broke the story ... according to the final report an investigator walked through Simon's bedroom with a woman who identified one side of Simon's bed as "her side of the bed." The woman's name was withheld from the report, but law enforcement sources have identified her as Brittany Murphy's mom Sharon.

In a statement, Sharon says, "I am very disturbed that the L.A. Coroners [sic] office continues to release things to the media that are misleading." 

She continues, "The TMZ story with it's [sic] salacious headline suggesting that my prescious [sic] son-in-law Simon and I slept in bed together, infering [sic] sexual contact is journalism at its lowest." Sharon also denies there were medications in the house prescribed to a "Sharon Monjack," as the Coroner's report states.

For the record, our story made it clear the Coroner's report did not suggest sexual contact between Sharon and Simon.

A Coroner's Office spokesperson tells us, "Our report speaks for itself."

Brittany Murphy's mother told investigators that she shared a bed with her daughter's husband Simon Monjack after Brittany passed away ... this according to sources close to the investigation.


The L.A. Coroner's Office just released their report on Simon Monjack's death.

In the report, the investigator documents an exchange with a person whose name has been withheld -- but whom law enforcement sources have identified as Brittany's mother, Sharon Murphy.

According to the report, the investigator and the unnamed person (Sharon) were going through the master bedroom in the Hollywood Hills home that Simon shared with Brittany ... when (Sharon) pointed to one side of Simon's bed and identified it as "her side of the bed."

Sharon also told the investigator that certain prescriptions in the nightstand -- bearing the names Sharon Murphy and Sharon Monjack -- were also hers.

The report doesn't suggest sexual contact between the two.

TMZ has learned ...a laptop computer has unearthed a secret Simon Monjack carried to his death -- he had two kids.


Simon's mom, brother and therapist stayed at Simon's home last week with Brittany Murphy's mom, Sharon Murphy.  We're told when they left they took Simon's laptop.

At some point they went through the computer and found emails from two women who wanted money from Simon for child support.  According to people who have reviewed the emails, Simon had a son by one baby mama and a daughter by another.

Also in the computer ... wire transfers of large amounts of money -- as much as $48,000 in a single transfer.  Simon was sending the money to lawyers, as well as someone in Europe for some sort of settlement.

We're told Simon's mom and brother felt the coroner should have the computer and handed it over.  The coroner's office is currently reviewing the contents.

Sharon went ballistic and filed a theft report with cops.