( CNN ) -- Prosecutors in Boston , Massachusetts , on Thursday filed paperwork in court that officially ended the murder case against `` Craigslist killer '' Philip Markoff , who committed suicide in jail last month . The Suffolk County District Attorney Daniel Conley said prosecutors had a `` very , very strong case '' against Markoff , but it was short-circuited when Markoff took his own life August 15 . `` What he did was abhorrent , it was disgraceful , it was brutal and he would have been held accountable , '' said Conley , who told reporters that the case file would be available to review in a few weeks . Markoff , 24 , was a second-year student at Boston University 's School of Medicine when arrested in April 2009 in the killing of Julissa Brisman , 25 , at Boston 's Copley Marriott Hotel . Police said that Brisman , a model , advertised as a masseuse on the online classifieds service Craigslist , and Markoff might have met her through the site . Authorities said Markoff killed himself in his jail cell by cutting himself multiple times with a makeshift scalpel crafted from a pen and a piece of metal . In addition , a large , clear plastic bag of a type issued to inmates was fastened around his neck with a piece of gauze . The name of his former fiancee , who called off their wedding after his arrest , was scrawled in what appeared to be blood on the wall of his cell when he was found , Conley told reporters at the time . Conley said the Brisman family was `` robbed of the opportunity '' to seek justice against Markoff .
NEW : DA files paperwork that ends murder case . NEW : Prosecutors to release their file on Markoff soon . The former medical student killed himself in jail August 15 .