Before revision: Notable lonely hearts and want-ad killers The following accused and convicted murderers and serial killers are known to have used want ads, personal ads, and/or matrimonial bureaus to contact their victims: Harvey Carignan (1927–2023) – known as "the want-ad killer""The Want Ad Killer" by Ann Rule, 1983 .
After revision: Elfriede Blauensteiner (1931–2003) – known as "the Black Widow"Notable lonely hearts and want-ad killers The following accused and convicted murderers and serial killers are known to have used want ads, personal ads, and/or matrimonial bureaus to contact their victims: Harvey Carignan (1927–2023) – known as "the want-ad killer""The Want Ad Killer" by Ann Rule, 1983 .