Dennis Lynn Rader is an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 serial killer

Serial killer

A serial killer, as typically defined, is an individual who has murdered three or more people over a period of more than a month, with down time between the murders, and whose motivation for killing is usually based on psychological gratification...

 who murdered ten people in Sedgwick County

Sedgwick County, Kansas

Sedgwick County is a county located in the U.S. state of Kansas. The county's population was 498,365 for the 2010 census. The largest city and county seat is Wichita. The county was named after General John Sedgwick...

 (in and around Wichita, Kansas

Wichita, Kansas

Wichita is the largest city in the U.S. state of Kansas.As of the 2010 census, the city population was 382,368. Located in south-central Kansas on the Arkansas River, Wichita is the county seat of Sedgwick County and the principal city of the Wichita metropolitan area...

), between 1974 and 1991.

He was known as the BTK killer (or the BTK strangler). "BTK" stands for "Bind, Torture, Kill", which was his famous signature. He sent letters describing the details of the killings to police and to local news outlets during the period of time in which the murders took place.

After a long hiatus in the 1990s through early 2000s, Rader resumed sending letters in 2004, leading to his 2005 arrest and subsequent conviction.