There are no clear details right now. It is unknown whether or not Brown was riding as a VC or on the sidewalk & using the pedestrian walkway, etc.
But I am familiar with this intersection. A very busy one that requires a lot of attention & care when crossing. Even though I ride VC, there had been times where it was so busy I dismounted my bike & crossed as a pedestrian using the crosswalk & the crosswalk signal, then remounted my bike & continued on as a VC. It is not the safest intersection in Des Moines & is one of the busiest in the area.