Horse trainer discovers pre-dug grave of missing teen on remote California trail

It was Labor Day weekend 2003 when Matt Scribner, a local horse farrier and trainer who also competes in long-distance horse races, was on his usual ride in a remote part of the Sierra Nevada foothills — just a few miles northeast of Auburn, California —when he noticed a freshly dug hole along the trail that piqued his curiosity. 

"48 Hours" contributor Natalie Morales revisited the site on horseback with Scribner, who told her, "The rest of my ride, I kept trying to justify why [the hole] was there."

"It sort of haunted you, it sounds like," said Morales.