...OK, the combination of "hanging" and "from a tree", that should not have been ruled a suicide without a thorough investigation first, and in combination with a suicide note that the next of kin verified "yeah, that was his handwriting". Regardless of the race of the one hanging, although that adds (significantly) to the doubt that it was a suicide.
"You know how parents tell you everything's going to fine, but you know they're lying to make you feel better? Everything's going to be fine." - The Doctor