Mafia 90. The Tale of Oldforest.

So, the probability that there was a killer in the group, and the sorcerer didn't kill, but instead used healing or redirection, is quite high.

There was only one person in the group, and that was the sorcerer. So, most likely, he was the one who killed. Killing in the first night while ignoring healing is a very good move, and the healing itself is pointless, as the Sheriff cannot kill in the first night, and the marksman won't be active.

Added 4 minutes later
What raises my suspicion is that Yaschur suddenly started attacking Mental after the newspaper, where it was proven that he wasn't Mafia. Olam has been very passive throughout this time, but that is unlikely to be a reason to suspect him. And based on the facts, the most likely Mafia member is the hero. But is a 50% chance and quiet behavior enough?