Two retired detectives say a serial killer is at work in Minnesota and Wisconsin, and have tied local river drownings to 40 other murders across the country.
Kevin Gannon and Anthony Duarte say 19 men were killed in Wisconsin and Minnesota, and the killers are leaving a grim mark on their victims.
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Families of possible victims are looking for help solving these crimes. Any informationt he public can offer is appreciated: http://sfkillers.com/