( CNN ) -- An autopsy on comedian Joan Rivers has been completed , but more studies will be needed to determine the cause and manner of her death , New York City medical examiner 's office spokeswoman Julie Bolcer said Friday . Rivers , 81 , died in a New York hospital Thursday afternoon , a week after suffering cardiac arrest during a medical procedure , her daughter said . Rivers had been on life support at Manhattan 's Mount Sinai hospital , where she was taken after she stopped breathing at the Yorkville Endoscopy clinic on August 28 . Joan Rivers : A pointed , pioneering comedian . Rivers was undergoing an apparently minor elective procedure at the clinic when she suffered cardiac and respiratory arrest , according to the New York Fire Department . Paramedics took her by ambulance to Mount Sinai Hospital , about a mile from the clinic , where she was initially listed in critical condition . The outpatient clinic is now being investigated by the New York State Department of Health , spokesman James O'Hara said . Joan Rivers : In her own words . No criminal investigations are currently under way in Rivers ' death , according to several New York law enforcement officials . The state health department is investigating whether there was any malpractice by the doctors and their staff , the same officials said . The Rivers family made very little information about her medical condition public , finally confirming Tuesday that she was on life support . `` My son and I would like to thank the doctors , nurses , and staff of Mount Sinai Hospital for the amazing care they provided for my mother , '' her daughter said . `` Cooper and I have found ourselves humbled by the outpouring of love , support , and prayers we have received from around the world . They have been heard and appreciated . ' Melissa Rivers and her son Cooper have spent the past week by Rivers ' hospital bedside , rushing there last Thursday when they learned of her illness . `` My mother 's greatest joy in life was to make people laugh , '' Melissa Rivers said . `` Although that is difficult to do right now , I know her final wish would be that we return to laughing soon . '' Share your memories . The clinic has not responded to repeated calls from CNN about the state 's investigation . Yorkville Endoscopy 's website says it is an `` ambulatory surgical center '' that has been `` approved by the Department of Health . '' The description of its accreditations is blank . `` Yorkville Endoscopy is a state of the art facility , staffed by highly experienced endoscopists whose mission is to provide safe and compassionate care to patients and their families , '' the website says . Tributes from Joan 's friends . The funeral for Rivers will be at Temple Emanu-El in Manhattan on Sunday , according to temple spokeswoman Elizabeth Fezrine . Details , including the time and if the public will be allowed to attend , are not yet known , she said . Tributes to Rivers and her long career included one from former first lady Nancy Reagan , whose close circle of friends included Rivers . `` Joan Rivers was not only a dear friend , but one of the kindest and funniest people I ever knew , '' Reagan said . `` I doubt there 's anyone who has n't laughed at her or with her until they cried . Today our tears are those of sadness . I know I join millions in saying , 'Thanks for the good times Joan , we will truly miss you . ' My love and deepest sympathy go to Melissa and Cooper . '' Former CNN host Larry King knew Rivers for 45 years . `` She knew no boundaries , '' King said . `` Everything was funny to her . You could n't really object because she took no prisoners . '' Hollywood mourns a friend . Donald Trump , who chose her as the winner on a season of `` Celebrity Apprentice , '' said Rivers `` was stronger at the end than she was at the beginning . She had unbelievable stamina . '' Ryan Seacrest , who worked with her on E ! shows , called Rivers `` a trailblazer in so many ways . '' Liza Minnelli said Rivers was `` my dear friend . '' `` I will miss her but I will always remember the laughter and friendship she brought into my life , '' Minnelli said . Opinion : Joan Rivers gave misfit girls permission to dream . E ! and NBCUniversal , producers of Rivers ' TV show `` Fashion Police , '' sent condolences to her family on `` this incredibly sad day . '' `` For decades Joan has made people laugh , shattered glass ceilings and revolutionized comedy , '' the studio said . `` She was unapologetic and fiercely dedicated to entertaining all of us and has left an indelible mark on the people that worked with her and on her legions of fans . She 's been a much beloved member of the E ! family for over 20 years and the world is less funny without her in it . Today our hearts are heavy knowing Joan will not be bounding through the doors . '' What Joan Rivers wanted at her funeral . People we 've lost in 2014 . See more about the people of comedy at CNN Comedy . CNN 's Marisa Marcellino , Susan Candiotti and Joan Yeam contributed to this report .
Further studies needed to determine cause , manner of death . Rivers , 81 , was undergoing a procedure at clinic ; she suffered cardiac and respiratory arrest . Rivers had been on life support at Manhattan 's Mount Sinai hospital .