A suburban Kansas City woman who already pleaded guilty to murder in a spree of videotaped sex killings also pleaded guilty Monday to kidnapping a 5-year-old girl while fleeing police in 2006.

The latest guilty plea by 42-year-old Dena Riley of Independence, Mo., was part of a December agreement under which she pleaded guilty to murder in the death of 41-year-old Marsha Spicer, said Riley’s attorney, Melanie Morgan.