This morning on SART just north of the southern most river crossing we came across a group of riders pulled over around 11am. As we pulled up we saw a person down with another rider performing CPR. We don't know what happened, who it was or how long the incident had been going on . We continued on to make run as paramedics were just pulling up and we really didn't want to stand around and stare. Not if anyone on here knows what happened, or who it was or the outcome. Honestly it didn't look good and really put a damper on the rest of the ride.