WICHITA, Kan. -

One of the most recognized faces of the Wichita Police Department has died.

Chief Norman Williams, Wichita Police, said Lieutenant Ken Landwehr died Monday after a battle with kidney cancer.

Landwehr, best known for his role in the BTK investigation, was 59 years old.

"The passing of Lt. Ken Landwehr is a true loss for his family, the Wichita Police Department and the City of Wichita. He was a highly skilled investigator and a tireless advocate for victims and their loved ones," Williams said.

"On behalf of the Wichita Police Department, I would like to express our deepest sympathy and support to his family and friends during this difficult time."

Landwehr was involved in more than 600 cases in a career that spanned more than 35 years. He retired from the police department in March of 2012.

Landwehr joined the police department in October 1978. He worked in patrol, vice, narcotics, cold case and homicide until he was promoted in 1989.

He was a supervisor in the forensic lab for two years. He became the Commander of Homicide in May 1992.

He graduated with a bachelors degree from Wichita State University, where he also taught undergraduate and graduate level courses in homicide investigation.