TheHe reportedly told the police that he was a good shooter and had committed last year to making memorial portraits of his victims.

He used a combination of chalk, pastel pencils and watercolors to capture the faces of 16 women in their last moments.

Bernie Nelson, an inspector who investigated one of the unsolved cases, told the Washington Post: "In talking to him, you can hear him talk about his homicide and the way he strangled his victims "