Something similar happened in downtown Boston last summer. It's very shocking and sad, but it's hard to understand what is going through the minds of those who do these things and take their children with them.
Almost happened to me. I was driving at night, and all of a sudden, I see a guy laying in the middle of a 4 lane road. A couple of people and I stopped and the guy couldn't speak english. There was a car parked further up the road, with it's lights on and a couple of mexicans in it. They didn't get out to see if he was ok. Apparently, he was in that car, and either he jumped out or was thrown out. Once they called 911, I left.