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A registered sex offender with a lengthy criminal history allegedly slaughtered the mother of his children and their four young kids inside their Kansas home, weeks after police had encounters with him over what the chief described as “erratic behavior.”

Ronald H. Williams Sr., 53, allegedly killed Kelly L. George, 44, and their four children, Carol A. Williams, 9; Ronald H. Williams Jr., 7; Sarah K. Williams, 5; and Kelly M. Magee-Williams, 3, before making a chilling 911 call…

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