Melissa Rivers speaks up about Joan Rivers' death

Melissa Rivers took to her WhoSay page to thank fans for their support in the wake of Joan Rivers' death.

She noted how she and her 13-year-old son appreciate the "kindness and support" they've received since her mother's death on Sept. 4.

Melissa added, "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. 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. We are forever grateful for your kindness and support in continuing to honor my mother's legacy, and for remembering the joy and laughter that she brought to so many."

Melissa will take part in a TV special and "Joan Day" marathon on E! this Friday.

Rivers was hospitalized on Aug. 28 after she went into cardiac arrest during the procedure. She died on Sept. 4 at age 81. The New York state health department is investigating the circumstances. Dr. Lawrence Cohen, the medical director where Rivers underwent her procedure, is no longer working at Yorkville Endoscopy.

Rivers was remembered at a star-studded funeral in Manhattan attended by family and many celebrity friends, including Hugh Jackman, Sarah Jessica Parker and Whoopi Goldberg.

On Monday, Jerry Seinfeld revealed that Rivers was going to be a lead guest on the new season of his series "Comedians in Cars Getting Coffee."