the task force put paul keller under surveillance. or ten days, they followed him, hoping they could catch him in the act. >> the task force people were trying to keep paul under surveillance which was real challenging. and they would lose him periodically. and everybody would panic. >> eventually they decided to take him into custody. >> all right, detective isaacson. >> yes. >> paul keller? >> yes. >> is your name paul keller? >> yes. >> you're under arrest. we have a warrant for your arrest. >> excuse me? >> when keller arrived at task force headquarters, his father was waiting for him. >> george keller is a bear of man. as he embraced him, he put his mouth close to his ear and hugged him tightly and said, it's all over, son. >> i said, it's all over. and i said, the life as you knew it before this morning is over. >> at first paul keller said he was innocent. >> am i going to jail today or am i going to be released on my own, since i never did anything wrong? >> 15 minutes into the interview, the task force agents complimented him