the answer, said karbon, is quite simple. >> murder for money?> potentially yes. >> reporter: money in the form of an insurance policy. >> i think he wanted out of the marriage and did whatever he needed to do to make sure that happened. and if he got $310,000 in insurance money, and got out of the marriage, all the better? >> yes. >> reporter: the evidence against tom foley was circumstantial but compelling. >> you think he faked that burglary? >> yes. >> and killed his wife? >> yes. >> reporter: they never found the murder weapon. >> what do you think happened to the gun? >> i wish i knew. >> reporter: but even without it, in march of 2009, one month after dar foley was gunned down in her shower, state police arrested tom foley and charged him with his wife's murder. >> and i just, "what?! how?! and i was like, "this cannot be happening! why do you think i did this?!" >> i did not kill my wife. >> reporter: to tom and dar's close friends the pierces, news of tom's arrest was almost as stunning as the news of dar's death. >> could you conceive o