Here is an excerpt from an email regarding what happened to my friend:
Guy and 2 friends from work were dropped off by the shuttle Sunday morning. They started to walk up to Sherman Peak and Guy said it was too steep and too long of a climb for him. They agreed that he would go back to the drop off place and wait for the guys to come down and they would proceed down the trail together. When the guys got back to the drop off place, no Guy. There were some bikers there and they asked if they saw a cyclist and they replied that no one was here when they got there. They were worried and started down. About 1/3 of the way down, there is a check point with a log. They stopped and read the log and Guy had written in the log that he would meet them at the truck. They proceeded down the trail and got to the truck and no Guy. They called the police when he didn't show up and they started the search and rescue team Monday all day. Couldn't find a trace of him. They wouldn't let any volunteers help on Monday. Monday evening they told us that they would use volunteers on Tuesday starting at 6 a.m. to walk the trails while the Search and Rescue personnel did some of the "harder" searches. They had them going down in the ravines and rocks. They found Guy's bike on the wrong trail in the afternoon today. The Search and Rescue could then concentrate their search to a much smaller area. This bike ride is like 27 miles. Anyway, they found Guy's bike, then some pads, then some pieces of maps and lost his trail. They found him on the other side of the hill via helicopter.