reporter: he told how he had left the camera with those last images of his wife behind. i would imagine i just dropped it while i was screaming. reporter: unable to locate leslie, he abandoned his search of the creek bed and made the decision to go for help. i hauled butt down to justin s house and i m honking and i scream at him to you know, i think my wife s dead. reporter: after listening to fred s story, the sheriff wanted to go up to the site of the accident. you take fred back up to the mountain? yes, we did a walkthrough on the scene. reporter: up at the scene, fred repeated how the dog seemed to cause leslie s fall. it was that damn dog tangled up in her legs is what i think it was. reporter: gracie ran off into the woods right after the accident. a member of the sheriff s department later found her and took her back to his house. everything changed that day. reporter: changed forever in ways the kids could not, in their immediate grief, begin to grasp.
for the hike. reporter: fred and leslie headed off with her dog gracie, a border collie pup. i think she was only 6 months old. reporter: was she rambunctious? she was rambunctious, for sure. she s the type of dog that when the ceiling fan would be going, she would try to jump up and like follow it around. reporter: fred and leslie parked at the base of the trail. snow still covered the ground in patches. they hiked up, past a small series of waterfalls. up until they found the perfect spot for pictures. they had arrived at cottonwood creek. fred struck a pose first. next, leslie s turn. one more of fred, big smile. and then leslie again. this time with her beloved gracie. then something went wrong. it s like it s just happening in slow motion in front of me. reporter: in an instant, leslie was gone. at the waterfall, she s in the river. reporter: what happened at cottonwood creek?
their theories, but did they have a case? fred went home to texas, where his family thought would be the end of it. his entire philosophy through all of this was it was an accident, i m telling the truth. and he wanted to cooperate. he wanted to help them see that. reporter: but investigators hadn t seen that. not at all. and if fred couldn t answer their questions, they d head back to cottonwood creek and hope that the water could. coming up fred has always said that water carried leslie away, to here, where her body was found. now investigators put that story to the test. we had to go back and try to duplicate the water flow as it was on the evening of the event. they said there was no way that her body could have ended up under that log unless it had been placed there. when dateline continues. that your digestive system isn t working at its best. taking metamucil everyday can help.
every year, we, as a species, deeper and deeper into bat habitat and those of other wild creatures. exposing ourselves to new, and dangerous, viruses. with the dramatic increase in travel, a rise in global trade, we re now capable of spreading those viruses, far and wide. scientists warn that what we ve
every year we as a species encroach deeper and deeper into bat habitat and those of other wild creatures, exposing ourselves to new and dangerous viruses. with the dramatic increase in travel, rise in global trade, we re now capable of spreading those viruses far and wide. scientists warn that what we ve created is the perfect storm for