David Walker

David Walker is a serial bomber who appears in season one.

Background
David is an antiquities dealer. In his early twenties he spent four years in prison for a series of forged checks. After being released he established a business and opened a store which sold maps, coins and historical documents with most of the inventory being fake.

Won't get Fooled Again
When he started promising his customers stuff he didn't have time to forge Walker got into debt. His client Barbara Keller found out about the fake coins Walker had sold her. If she had outed him, all his forgeries would have been discovered. So Walker plants a bomb to kill her. He then sets other bombs to throw the police off the track.

Walker's bombs are exact duplicates of those made by Adrian Bale, the Boston Bomber who is responsible for the deaths of six FBI agents from Gideons former unit. When Walker sends an innocent man with a necklace bomb to the police station, Hotch and Elle confront Walker, who blows himself up. Gideon then tries to make a deal with Adrian Bale. Bale leads the bomb squad through disabling the bomb until there is just one move to make - cut the red or blue wire. Bale tells him to cut the red wire. Gideon hesitates and then tells the bomb squad to cut the blue. The timer stops and Bale goes back to jail. When Elle asks Gideon how he knew, Gideon answers that Bale had said given the opportunity of pressing that button, he'd have no choice.

Appearances

 * Season One
 * Won't Get Fooled Again