One police detective called Alcala “a killing machine” and others have compared him with Ted Bundy. A homicide investigator familiar with the evidence speculates that he could have murdered as many as 50 women, while other estimates have run as high as 130. Prosecutors say that Alcala “toyed” with his victims, strangling them until they lost consciousness, then waiting until they revived, sometimes repeating this process several times before finally killing them. Police discovered a collection of more than 1,000 photographs taken by Alcala, mostly of women and teenaged boys, most of them in sexually explicit poses. They speculate that some of his photographic subjects could be additional victims.