Melissa Rivers to sue over Joan River's death

After inheriting her mother's $100m estate, Joan River's daughter, Melissa is set to sue the medical center whereshe died..According to TMZ '

Melissa Rivers will sue the medical center where Joan died and the doctors as well because it's the only way she can find out what really happened to her mom.

After the New York Dept. of Health and Human Services came out with its findings that Yorkville Endoscopy LLC was "deficient" in surgical services and medical staff ... Melissa tried to find out the root of the problems and if they caused her mom's death, but she was shut down.

Melissa, we're told, is frustrated because it's apparent the facility and the Dept. of Health know exactly what happened, so her only recourse is court.

The renowned comedian and Fashion Police host died at 81.