CHICAGO , Illinois ( CNN ) -- Police are investigating the death of the former chief fundraiser for ex-Illinois Gov . Rod Blagojevich as a `` death-suicide , '' an Illinois mayor said Sunday . Christopher Kelly , 51 , was former Illinois Gov . Rod Blagojevich 's chief fundraiser . Financier Christopher Kelly told police shortly before he died Saturday that he took an `` overdose of drugs , '' said Dwight Welch , mayor of Country Club Hills , Illinois . Country Club Hills police found several drugs in Kelly 's black 2007 Cadillac Escalade , but they were not sure yet whether they were prescribed , Welch said . Country Club Hills is about 27 miles south of Chicago . Kelly had recently undergone surgery and was taking drugs following the operation , Welch said . Welch said he did not know which drugs Kelly was taking . Kelly , 51 , of Burr Ridge , Illinois , was pronounced dead at Stroger hospital in Cook County at 10:46 a.m. Saturday , hospital spokesman Marcel Bright told CNN . Autopsy results were expected Sunday afternoon , Welch said . The Cook County Medical Examiner 's Office did not comment on the results , but said that a ruling on Kelly 's death was `` pending further studies . '' Toxicology results wo n't be available for `` some time , '' Welch said . Blagojevich blamed the government for Kelly 's death . `` I do n't know any more than you know , except that a friend of mine took his life because he refused to submit to the pressure by the government to lie about me , '' Blagojevich told CNN . `` And to think that it comes to something like that begs a lot of questions . '' Blagojevich said his statement that Kelly `` took his life '' was based on what he had read in news reports . Earlier this year , Blagojevich , who was impeached and removed from office , pleaded not guilty to federal corruption charges . A federal grand jury in April indicted him on 16 felony counts , including racketeering , conspiracy , wire fraud and making false statements to investigators . The indictment also named Kelly . On Tuesday in a separate case , Kelly pleaded guilty to two counts of mail fraud `` in a kickback scheme to bring in $ 8.5 million in business at O'Hare International Airport to his roofing company , '' the Chicago Tribune reported on its Web site Sunday . Kelly was to begin a prison sentence this week , the Tribune reported . Kelly was transferred to Stroger hospital after first receiving care at Oak Forest Hospital , near Country Club Hills , where police spoke to him at about 3:30 a.m. CT Saturday , Welch said . Police described Kelly as being `` very hesitant , very ill '' during that interview , Welch said . As part of their investigation , police want to talk further with Kelly 's girlfriend , Clarissa Flores-Buhelos , Welch said at a news conference Sunday . Kelly and Flores-Buhelos , 30 , communicated via text messages before she drove from Chicago to pick him up , Welch said . She found him ill and drove him in his car to Oak Forest Hospital , he said . She told police that Kelly had attempted suicide , Welch said . But since then , Flores-Buhelos has retained a lawyer and is not talking to police , Welch said . Police plan to use the text messages and the GPS device in Kelly 's car to determine where the two were prior to arriving at the hospital . Police also want to talk to a man who came to Oak Forest Hospital to pick up Kelly 's car , Welch said . He has keys to the vehicle but the car has been confiscated by the police as evidence , Welch said . Chicago police and the FBI are also involved in the investigation , Welch said . CNN 's Jesse Solomon and Justin Lear contributed to this report .
NEW : Police want to talk to Kelly 's girlfriend , who took him to hospital , mayor says . Kelly , before dying , told police he overdosed , an Kelly mayor says . Blagojevich was named in indictment in Kelly case . In separate case , Kelly pleaded guilty to mail fraud on April .