I think someone already referenced this earlier in the post, but Rick's Boatyard Café is the same location Jennifer Andersen, who's been missing since 2010, was found. Like James, little information was available about her case as well. The only thing mentioned was that she had a history of depression...which would seem to me to imply they both likely killed themselves.
http://www.charleyproject.org/cases/a/andersen_jennifer.html
I live in Omaha but admit I'm not familiar with Rick's Boatyard café. It strikes me as strange that 2 people with a history of depression leave their car at the same restaurant 2.5 years apart.
If you were going to kill yourself in the Missouri River, why wouldn't you jump from the pedestrian bridge that goes over the river less than 1000 feet away? Why leave your car and walk through a wooded area? I don't mean to sound crass, I just find it peculiar that 2 unrelated people would decide to kill themselves by walking into the river in the same strange area. If anyone can think of a reason I'm missing, I'd love to hear your thoughts.