A 65-year-old Ohio woman who was bicycling down the mountain as part of a Maui Mountain Cruisers tour group evidently lost control of her bike, crossed into the oncoming lane, and was hit by a van from another tour group. Both the bike and woman came to rest underneath the van and trailer. The accident occurred on a hairpin curve about 50 yards above park headquarters and was observed by a number of visitors in the headquarters area. The emergency response was immediate. Rangers responded with life support equipment and found a physician from another tour treating her when they arrived. The rangers established an airway, administered oxygen, and began CPR. They sustained it until an AMR ambulance arrived and paramedics took over. Following consultation with a doctor, they eventually suspended resuscitation efforts and pronounced her dead at the scene. Witnesses and family members were cared for in the park and interviewed. A chaplain familiar with critical incident stress helped everyone involved. An investigation is ongoing.