silence a .40 caliber handgun. >> glock specifically, which is the gun he owned. >> he owned and she was shot with. how to silence that. how to overdose somebody on insulin. >> bathtub. >> drowning. >> electrocution. >> in the bathtub. things like that. this goes back several months before the murder. >> so he's potentially thinking up all these different ways to kill his wife. >> well, you know, i honestly think he planned it out. >> did you straight up ask him, did you have anything to do with your wife's death? >> yeah. >> and? >> he denied it. >> he said no. >> not only did he deny killing his wife, nathan told us there was a perfectly reasonable explanation for all the searches the police uncovered. >> electrocution in the bathtub, how to silence a gun. >> we had a -- started a foundation overseas called hope for tomorrow to combat suicide. and we were doing research and looking at blog sites where young people, where desperate