It's been many years since Dennis Rader terrorized Wichita. Using the signature BTK--for bind, torture, kill--he murdered 10 people, often fading away between killings. A new book delves into Rader's motivations through phone calls and letters with the author.

KMUW's Aileen LeBlanc talked with author Katherine Ramsland on a computer phone call. Ramsland has written many books on serial killers and is director of the Master of Arts in Criminal Justice program at DeSales University in Pennsylvania.

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.