The New York state health department is investigating the circumstances surrounding Joan Rivers's cardiac arrest during an outpatient procedure.
Spokesman James O'Hare said Thursday that the department is looking into "the whole matter." He declined to discuss specifics.
Rivers, who once described herself as the "plastic surgery poster girl" and joked about her numerous procedures, stopped breathing after suffering cardiac arrest.
The 81-year-old comic and red carpet commentator was hospitalized last week after the incident, which happened at an endoscopy clinic where Rivers was having a procedure performed on her throat.
Her family said Wednesday that Rivers has been moved from intensive care at Mount Sinai Hospital into a private room, where she was "being kept comfortable."
No further details were released on her condition.
E! puts show on hiatus
E! network says Joan Rivers's weekly Fashion Police series is on hiatus.
The long-running program, which normally airs fresh episodes on Fridays, is on break this week and next, the network announced, "as we await Joan and Melissa's return in front and behind the camera." Rivers's daughter, Melissa Rivers, is its executive producer.
In its place, the network plans to air two special programs focusing on New York Fashion Week.
During her lengthy career, the husky-voiced, Brooklyn-born comedian won fame for her put-downs and was known for asking, "Can we talk?"
Rivers wanted to be an actress but got into comedy after writing sketches for television's The Ed Sullivan Show. A career in stand-up followed. She later worked as a regular guest host for Johnny Carson on NBC's The Tonight Show.
When she started her own late-night talk show in 1986, on the rival Fox network, it caused a falling-out with Carson that lasted until he died in 2005. Rivers's show was cancelled after seven months.
Rivers also had an Emmy Award-winning daytime talk show, The Joan Rivers Show, and later hosted Fashion Police, commenting on the unfortunate red carpet choices of celebrities.
Rivers won Donald Trump's reality TV show The Apprentice in 2009 and starred in the reality TV program Joan & Melissa: Joan Knows Best?