Retired Wichita police Lt. Ken Landwehr has died at the age of 59.
Landwehr supervised more than 600 homicide investigations during his career.
Police Chief Norman Williams says Landwehr had kidney cancer and died Monday in his home.
Landwehr retired in 2012 after a 35-year career with the Wichita Police Department.
He is credited with breaking the BTK serial killer case.