They hiked up, past a 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 just happened in slow motion in front of me. >> in an instant, leslie was gone. >> at the waterfall. she's in the river. >> what happened at cottonwood creek? >> coming up -- >> is she dead? tell them its too soon to know. >> the hunt for answers would start with a frantic search. >> at ...