一名球员立刻离开了小组，我不知道如何处理他的角色

I had a player message me a few hours before our 5e session, "Hey I'm quitting the group, would it be too much of a hassle to kill off my character tonight?" I said that's fine, thinking I would fudge some combat rolls near the end of the night to kill the character. I was under the impression that he would play one last session; we waited for him to arrive later that evening. but after a while and a text message, I realised he wasn't coming at all.I had a player message me a few hours before ou