Melissa Rivers Planning to File Multimillion-Dollar Wrongful Death Lawsuit Against Clinic Where Joan Rivers Went Into Cardiac Arrest

Comic legend and Fashion Police host died Sept. 4, officially due to having her oxygen pathway cut off at some point during an endoscopy

Melissa Rivers is seeking answers—and damages.

A rep for Joan Rivers' daughter confirms to E! News that she is planning to file a multimillion-dollar wrongful death lawsuit against the New York endoscopy clinic where her mother suffered cardiac arrest, as well as all of the doctors involved in peforming the procedure in question.

Gair, Gair, Conason, Steigman, Mackauf, Bloom & Rubinowitz, the law office hired by Melissa, also confirmed its involvement. Partner Ben Rubinowitz said in a statement, "In order to fully determine all of the facts and circumstances surrounding the death of Joan Rivers, we confirm that our firm has been engaged by Melissa Rivers and her family."

The New York City Office of Chief Medical Examiner attributed Joan's death Sept. 4 at the age of 81 to "therapeutic complication," the exact cause being "anoxic encephalopathy due to hypoxic arrest during laryngoscopy and upper gastrointestinal endoscopy with propofol sedation for evaluation of voice changes and gastroesophageal reflux disease."

Melissa's lawyers will first need to obtain her medical records before proceeding with the filing of their complaint.

Joan visited Yorkville Endoscopy on Manhattan's Upper East Side on the morning of Aug. 28. At some point during the procedure the legendary comedian and Fashion Police host stopped breathing and was rushed to Mount Sinai Hospital, where she ultimately was placed on life support.

The clinic later denied a New York Daily News report that Joan's personal physician also performed an unscheduled biopsy on the legendary comedian's vocal cords while she was at the clinic and stated that she was "under light to moderate sedation," rather than general anesthesia.

"As my son Cooper and I mourn the loss of my mother, we want to thank everyone for the beautiful cards and flowers conveying heartfelt messages and condolences, which continue to arrive from around the world and through social media," Melissa wrote on WhoSay Sept. 17. "My mother would have been overwhelmed by the scope and depth of the love that people have expressed for her. It is certainly helping to lift our spirits during this time."

Also that week, Melissa confirmed that Fashion Police would carry on in 2015 on E!, thanking all the "Joan Rangers for the outpouring of love and support."