A woman is claiming her late father was one of the most prolific serial killers in American history, responsible for the deaths of 50 to 70 women during a span of more than 30 years. Lucy Studey, who chose to have herself identified publicly, told Newsweek that her father, Donald Dean Studey, who died in 2013 at the age of 75, had her and her siblings help him move the bodies of the female murder victims buried near a well on his property outside Thurman, Iowa.