Game crashed during ranked match. [CRASH]

I'm sorry; I don't have any evidence to back this up other than the game footage where I randomly stop moving due to the crash, which seems useless. I was doing ranked with my duo buddy, and we were destroying the enemy team, objective and kill wise. I often have 100 ping in my games, but I doubt it had much to do with this issue. In the first "massive" teamfight of this match, my client quite literally froze, as if it was a picture. I waited for the client to unfreeze, but it never did, so I tried to close the client manually, but to no avail did this work. So I closed the client with task manager, which worked. This is where the problem lies. Once I quit the game, I could not rejoin. Simply put, the new client refused to load the game. The game usually loads immediately after relogging, but it did not, and there was no button that allowed me to rejoin. All it said was "Game in process..." I looked in my processes, and found something unusual. The process for league was still running from the previous task manager close. I tried to end it, but once again, it refused to end. RIP LP; you will be sorely missed.