Notorious Murderers and Serial Killers

How many black widow serial killers are known?


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This should not be considered a complete list:

Lyda Ambrose, Velma Barfield, Marie Becker, Betty Lou Beets, Elfriede Blauensteiner, Mary Anne Britland, Judias Buenoano, Cleveland Black Widow Killer (couldn't find a name for this one), Jill Coit, Eva Coo, Mary Ann Cotton, Lydia Trueblood, Marie Hilley.