This might suck for weird reasons. One of my buddies, who got me into playing league, passed away a few years ago. Every time I sign on, I still see his user name as "away". It's a nice reminder of him. RIP BearT0wn.
I can't make any promises but we've seen a number of people specifically talk about a scenario involving the loss of loved ones. We'll be talking about it internally to see if we can balance deleting player data vs keeping them around.
I'd like a way to at the very least immortalise the connections people made even if the account is gone. I don't know if it's possible but I'm going to do what I can.