 Despite this, there were several occasions where his past has caught up with him.During the sixth season, while dealing with his complicated relationship with Brennan and his new girlfriend Hannah Burley (Katheryn Winnick), Booth faces his former mentor Jacob Broadsky, a former Army sniper who has apparently gone rogue.Broadsky kills the Gravedigger, a serial kidnapper and killer who threatened both Booth and Brennan, destroys identifying evidence, and escapes.