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 several inconsistencies between DeSalvo's confessions and the crime scene evidence. For example, DeSalvo did not, as he claimed, strangle Sullivan with his bare hands; instead, she was strangled by ligature. Forensic pathologist Michael Baden noted that DeSalvo incorrectly stated the time of the victim's death—a detail that DeSalvo got wrong in several of the murders, said Susan Kelly. Finally, James Starrs, professor of forensic science at George Washington University, told a news conference that a semen-like substance on her body did not match DeSalvo's DNA and could not associate him with her murder. The victim's nephew, Casey Sherman, also wrote