Please remember that the video of police brutality on Rodney King was not showing how it started. The guy who recorded it happened to see the beatings and recorded it with his camcorder so he didn't know how it started. What's more, King admitted that what he did was wrong. In other words, he didn't follow police's instructions like putting his hands up and laying on the ground. He didn't. The video didn't show that, however the cops who beat him were guilty of excessive force which was unacceptable.
It's possible that he drowned in his own pool. I heard that many blacks don't know how to swim. I don't know for a fact.