Recieving death threats from player, will riot do something about this?

I am actually really worried right now, because this player added me after a game and at first it was random trash talk nothing special but then at one point he began saying disgusting things and I am actually really scared right now, Is there any legal action that can be taken because this is extremely stressful and I really don't know what to do, I will block him and I already sent Riot a support ticket. Honestly extremely disturbing
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