Interesting legal twist/loophole:
His case in the murder of Odin Lloyd was under appeal (and therefore hadn't reached its final conclusion). By law, since he died before the case was officially decided and thus can't defend himself, the state will have to drop the charges against him in that case.
It's assumed in the next month or so that his lawyers will go to court and officially request that the case be dropped, which it then will be. Since he was (somehow) acquitted on the double murder charges as well, officially in the eyes of the law, Aaron Hernandez won't be recorded as a murderer/felon.
This will also have further implications - the civil cases against him in wrongful death in the various murders, where the families are trying to get money as a judgment will be much much harder to win for them now. Also - the signing bonus money he was owed by the Patriots that was forfeited as a result of the murders (breach of contract), now has a good chance of having to be paid out to his estate.
Some pretty good motives here for committing suicide, if for once he finally thought of someone other than himself (his family) and wanted to make sure they were all set financially.