saturday evening, off-duty cop and wakefest security officer chris yarchuk bumps into lauren at the bar. what'd you make of her? >> >> reporter: he sees her leave at around 2:00 a.m., finding her a night of drinking with hannah, chris and aaron. so they left. >> they left. the last time i saw them, yeah. >> reporter: they're heading to their camping spot, an outcropping across from the houseboats that make up wakefest. there's an impressive 35-foot drop to the lake on one side, a 90-foot drop on the other. hannah and her boyfriend aaron will crash in a tent. lauren and chris will bunk together in a hammock on the edge of the cliff.

remember chris yarchuk? he worked security at wakefest and met lauren the night before she died.off. your radar kind of was raised right away. >> absolutely. >> reporter: he leads us up to the campsite. a snake infested, rocky area. we took the same route as lauren as her friends, with the steep incline. even with a rope, it's no small task. it is not easy getting up here. okay. so, this is the spot. wow, that's quite a trek. >> great view, though. >> reporter: the terrain is treacherous. even in daylight. it's hard to believe that they came up here in the middle of the night. and they're intoxicated, too. this area here is where lauren and the others set up their campsite. do you believe she slipped down this hill and fell to her death? >> i do not. >> reporter: yarchuk's main question, how did lauren's body end up in a cove, hundreds of feet away from the cliff? if she fell off the steep side, her body would have had to travel around a large bend. and if she fell off the other side with the more gradual incline, he wonders, would she have ended up in the water? if she slipped a

saturday evening, off-duty cop and wakefest security officer chris yarchuk bumps into lauren at the bar. what'd you make of her? >> >> reporter: he sees her leave at around 2:00 a.m., finding her a night of drinking with hannah, chris and aaron. so they left. >> they left. the last time i saw them, yeah. >> reporter: they're heading to their camping spot, an outcropping across from the houseboats that make up wakefest. there's an impressive 35-foot drop to the lake on one side, a 90-foot drop on the other. hannah and her boyfriend aaron will crash in a tent. lauren and chris will bunk together in a hammock on the edge of the cliff. incredible anyone would think to sleep so dangerously close to a precipice. samantha arnold, friends with lauren and hannah, was on the cliff with the group the night before lauren died and says it was scary but thrilling too. >> it was very steep, i'm climbing and i'm climbing. and my legs are slipping. >> reporter: chris and aaron would later tell police the wakefest weekend is going well. >> you know, we all drank, had a good old time. eventually we ended