Actually apologies Deuse, the tyre didn't hit Chilton.
I remembered that he pulled into the pitlane under the red flag (not allowed back then) to repair damage, so I checked to make sure that the debris had deflected off the nose and towards his helmet, but it deflected inches above his helmet. I doubt it would have injured him anyway given the much reduced energy from hitting his nose first, but he probably wouldn't have been allowed to race.
Sorry about that, I could have sworn he/someone had said it had hit him in the head.
F1 alone I guess the last confirmed one was Senna in 1994. Perhaps that exact one would be prevented by the since-raised cockpit side protection (hopefully as well as the wheel tethers), though I suppose that's impossible to know.
Just a couple of races before that, Brundle suffered a luckily only glancing blow when Irvine triggered Verstappen's terrible crash at Interlagos.
I don't recall if Chandhok himself was struck by Trulli's car (I guess I would if he was), and likewise I've no idea if anyone was hit in the 2nd phase of the Monza 2000 tragedy (apparently de la Rosa rolled over the top of Coulthard's car).
Reading up, I wasn't aware that Sergio Perez's Sauber was struck by a piece of ballast at Sepang 2011. Apparently it went clean through the safety cell before destroying some electronics which led to his immediate retirement and requirement for a new chassis for Shanghai! Even more scary than Alesi's onboard camera destroying Berger's left-front suspension.