i opened the door, so i -- i went in, i found bianca rudolph. ying down here with a shotgun was just near her foot. i touched bianca, she was not breathing. >> and when kakoma got to the cabin, he says larry rudolph was frantic. >> and the husband, larry rudolph, he was standing near to her body, crying, "what am i going to tell my children? what am i going to tell my children. let me just kill myself because my wife, she has committed suicide." i took hold of him by the hands. >> so you grabbed him strong? forcefully? >> yes. i started comforting him. don't kill yourself. >> but kakoma says that larry pulled away from him and then ran towards the kafue river. he wanted to throw himself in the river. i mean, this is a very fast moving river right now. what happens if you throw yourself in this river? >> you die, or you will be eaten by a crocodile. there is a lot of crocodile here. >> now, right there on the kafue river, kakoma says that he asked rudolph about bianca's death a second time. >> "what happened, what has really happened?" and he told

our "20/20" team spent months investigating the death of bianca rudolph, and when we traveled to thatcamp in zambia, we realized it was a terrible place for an accident to happen, but a perfect place for a murder to happen, and that dentist might have gotten away with it had it not been for a bartender who overheard something years later. visiting the famed hunting grounds at this national park in zambia in late september of 2016 ws a wealthy american dentist larry rudolph and his wife bianca. who had an reputation as an extra marksperson. on october 11, 2016, bianca and larry are getting ready to leave zambia when suddenly a shotgun blast rings out. >> standing near to her body, crying. what am i going to tell my children? what am i going to tell my children? just kill myself because my wife, she has committed suicide. >> something was amiss. something was fishy to our eyes. >> reporter: but that doesn't ed the suspicion, because shortly after that, larry has cashed out nine separate life insurance policies, taken out in bianca's name, and now he's got nearly $5 million. he's also go