Albert DeSalvo Sullivan. Nine days later, investigators announced that the comparison of crime scene evidence and DeSalvo's DNA "leaves no doubt that Albert DeSalvo was responsible for the brutal murder of Mary Sullivan". George Nassar, the inmate DeSalvo reportedly confessed to, is among the suspects in the case. He is currently serving a life sentence for the 1967 shooting death of an Andover, Massachusetts, gas station attendant. In 2008 and again in 2009, the Massachusetts Supreme Judicial Court denied Nassar's appeals of his 1967 conviction. In 2006, Nassar argued in court filings that he had been unable to make his case in
Serial killer Serial killer A serial killer is typically a person who murders three or more people, usually in service of abnormal psychological gratification, with the murders taking place over more than a month and including a significant period of time between them. Different authorities apply different criteria when designating serial killers. While most set a threshold of three murders, others extend it to four or lessen it to two. The Federal Bureau of Investigation (FBI), for example, defines serial killing as "a series of two or more murders, committed as separate events, usually, but not always, by one offender acting alone".