Myself and 2 other jumpers were geared up and ready to go down to the exit when a solo jumper arrived to the gear up area. We exchanged names and wished each other a good jump. The 3 of us had successful jumps.
After 10-15 min in the BASE LZ, I looked up at the exit and thought I could see the solo jumper on the platform. I started to walk from the LZ on the road to the parking lot. I missed the initial exit, but shortly after could see a red Wingsuit in an unstable and uncontrolled freefall, spinning.
About 3/4 below exit it appeared he regained control but was close and flying parallel to the wall. At that moment a tree obscured my view as we were slowly walking. I had expected to see a canopy right after passing the tree, but did not. Then heard a very loud crack, similar to a loud gunshot.
I tried to get a better view of the talus to see if there was any sign of the jumper. A call was made to air glacier and rega. Shortly after an air glacier helicopter made multiple passes in the area and then landed next to the PG landing zone. We spoke with the local police and air glaciers about what we saw and heard, others had also heard the same sound.
They went up to search on foot and eventually after about an hour, did find the jumper deceased in the area we had suspected below exit.