Blacks can’t swim. If there was foul play the decomposition would increase the likelihood of getting away with it.
I wouldn’t say that black people can’t swim, I taught swimming for years through high school and college. While it’s true that far too many never learn and quite a few have issues with getting their hair wet, I never had a black student who didn’t learn to swim. Floating was another matter though, unless they were heavier. Low body fat means floating is difficult. You reach equilibrium and float eventually but for muscular people with little body fat that equilibrium can be several feet below the surface of the water.
Local radio stated that he was in a jogging outfit, out on a run apparently.