a call from a woman named rachel bingham.e had been blocking out was a bombshell. her ex-husband, martin bond, told her he and a friend, named benjamin rettig, wept nt to kay house to steal his guns. >> he wasn't willing at first but he eventually did. >> reporter: bond, she said, told her everything. >> they took him to the bathroom and bent him over the tub. >> reporter: and cut his throat. and then. >> he said, right after that, they heard the door -- the doorbell ring. and it was the two. >> reporter: the two were roger and pam and we know the rest of the story. rachel bingham kept the secret, for months. until, finally, her conscience won out. and she told police one more thing. how the crooks got the drop on kay mortensen. it turns out, martin's dad and kay were old friends. which is why kay, armed against intruders, welcomed them in and turned his back to his killers. >> he had planned for any worst-case scenario to happen, except for the one that happened to him. >> in that, there are so many ironies, aren't there? >>