The New York City Department of Health is investigating the incident , its spokesman says . Joan Rivers stopped breathing at the Manhattan Endoscopy clinic last week . Rivers was on life support and died at a New York hospital Thursday afternoon , a week after suffering cardiac arrest during a medical procedure , her daughter said . Rivers died Thursday afternoon at a Manhattan hospital . The clinic has not responded to CNN requests for comment .
The New York City Department of Health is investigating the incident , its spokesman says . Joan Rivers stopped breathing at the Manhattan Endoscopy clinic last week . Rivers died Thursday afternoon at a Manhattan hospital . The clinic has not responded to CNN requests for comment .