Clinton David Brink, 43, and Cristen Amanda Brink, 41, were killed on a walking trail at Devil's Den State Park in Arkansas.

The 27-year-old Nevada man left a note at the scene voicing anger that his mental illness may be linked to his having played football, officials familiar with the investigation told NBC News.

This is the impressive moment locals were seen sliding down a handrail along 2,000 steps in a park. Jan Thomas Sandvik and his friends were climbing Linabo Peak when they saw two residents using the ...