In-game Threats and Suicide encouragement.

I wasn't sure where to put this or anything. But my girlfriend was playing a game and had a few players in the end encouraging her to kill her self. We tried reporting in-game but it being the new client it crashed when we tried to do so. Any info on how to go about reporting said player would be great. I've opened a ticket with Riot, but they don't even have a place to open a ticket for this sort of thing that I could find. Again thanks for any help in advance. Some people don't know how the can affect someone IRL .