Told to harm myself in private chat

Hello to all reading this, I just played a game, as lux and was playing, however I ended up doing very poorly as I was playing against velkoz, and for the life of me I cant seem to beat the champ. The game went on and we unfortunately lost with me trying to keep a level head through my team flaming me. The game went through and I was added by one of my teammates who messaged me calling me a racial slur and telling me 'this world would be better off without me', league is usually where i go to escape this exact sentence, I was able to get a screenshot I just don't know what to do with it and how to get this player banned. Thank you for taking the time to read and respond, any help is great!
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