NYC-based law firm Gair, Gair, Conason, Steigman, Mackauf, Bloom & Rubinowitz will look into Rivers' death following reportedly a botched procedure, reported Us Weekly.
"In order to fully determine the facts and circumstances surrounding the death of Joan Rivers, we confirm that our firm has been engaged by Melissa Rivers and her family," said Ben Rubinowitz, managing partner at Gair, Gair, Conason.
Melissa is expected to file a multimillion-dollar lawsuit against the NYC-based clinic which her mother visited before her death.
Joan Rivers, 81, visited the clinic on August 28 for a routine diagnostic procedure to determine why her voice had gotten raspy.
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She apparently agreed to an endoscopy, but not an unplanned throat biopsy, during which she stopped breathing. She died on September 4.
The cause of her death was due the result of low blood oxygen to the brain during the endoscopy.
Melissa tweeted a response to the findings that same day, writing: "In response to NYC's Medical Examiner's report, we continue to be saddened by our tragic loss. No further comment at this time.