Albert DeSalvo F. Conley said he expected investigators to find an exact match when the evidence is compared with his DNA. On July 19, 2013, Suffolk County DA Daniel F. Conley, Mass. Attorney General Martha Coakley and Boston Police Commissioner Edward F. Davis announced that DNA test results proved DeSalvo was the source of seminal fluid recovered at the scene of Sullivan's 1964 murder. Though DeSalvo was conclusively linked to Mary Sullivan's murder, doubts remain as to whether he committed all of the Boston Strangler homicides — and whether another killer could still be at large. When he confessed, people who knew
Albert DeSalvo a previous appeal, because he was in federal prison in Leavenworth, Kansas, in the 1980s and therefore did not have access to Massachusetts legal resources. The court noted that Nassar had returned to Massachusetts in 1983, yet he did not plead his case for more than two decades. Nassar also filed a motion for a new trial in Essex County, which was denied, as was his 2011 petition to the United States Supreme Court for a writ of certiorari. Ames Robey, a former prison psychologist who analyzed both DeSalvo and Nassar, has called Nassar a misogynistic, psychopathic killer and a