I was playing as Scav and looting the MedCamp when I heard some footsteps. I aimed in the direction from which the sound came and zoomed in. When the player appeared on my screen, he was already looking at me as he came around the corner, not even considering other angles from which he could be shot and killed, almost as if he already knew where I was (I guess wallhacks). When I saw the actual kill screen, it said he gave me a "head, eyes" shot, so basically right in the face before I even had a chance to aim and shoot at him, even though I held that angle first. So I think the player at least had wallhacks, if not some kind of aim-assist or aimbot.
Player name: QianMax-CN