it was mark jensen's computer in mark jensen's den. >> for nearly 25 years mark jensen and his defensehe plotted this? >> what if, as the defense suggested, julie's death was a suicide carefully orchestrated to frame the man that she had, at one point, wanted to divorce? >> what brings us here today is julie jensen's suicide. >> so those searches about ethylene glycol, julie did those searches. >> the suicide of a woman who was in declining mental health, who was seeing her family doctor for prescriptions for her mental illness, for her depression. >> so, she took her own life, and made sure that all the pieces pointed to the fact that she was murdered. >> if this were a suicide with the goal of vengeance, wow, this was really a brilliant plan. >> no one who knew julie knew her as someone who was at risk for suicide and particularly, not just suicide, but the most extraordinarily manipulative behavior that would be needed if she had killed herself in this manner. the person who is the manipulator here is mark jensen. >> ethylene glycol isn't something that they looked for at the initia

>> ed clue was a co-worker of mark jensen.t. louis. and one night over drinks, they were sort of commiserating about their unhappy marriages. >> he talked about how he hated his wife, and then he talked about poisons, you know, they're undetectable in a normal autopsy. >> mark jensen had told him you'd feed her benadryl and mix it with another drug that would crystallize you from the inside out which is what antifreeze does. >> did it ever occur to you to pick up the phone and call julie and know warn her? >> i didn't know julie but how would she have perceived a call from a stranger that she never knew? hey, julie, i was in st. louis drinking with your husband, and he wants you dead. thinking back if maybe i had said that, maybe he would have gotten rid of me. i was his loose end, i was his problem. >> you were afraid of him? >> i was afraid of him, yes. >> what did you think he would do to you? >> i don't know. i mean, if he's capable of killing his wife, you know, he could kill me and my children or my wife. >> so this case