I was playing as Pharah, and got booped off the map with no jump jets, and ended up falling into one of the rivers. As soon as I died the entire Overwatch application froze and I needed to open the task manager to close and restart.
Since more people are reporting crashes and freezes, it probably has to be the rialto patch, since i got one freeze today, after dying as briggitte on Lijian tower, i would wait for a fix from blizz