Team Lotus (and BRM) F1 driver Mike Spence died at the wheel of a Lotus Type 56 turbine 4WD on 7 May 1968 during practice for the Indianapolis 500. He had replaced Jimmy in the STP TL Indy team, racing alongside Graham Hill. Mike had been extremely quick up until his accident, posting the fastest lap despite being an Indy rookie. He may well have gone on to take pole.
At the time of his death, Mike had a Lotus dealership in Maidenhead town centre, and resided nearby with his new wife Lynn. His funeral was held in Bray church (my childhood village - and not far from where @Bazza 907 grew up) and he was subsequently cremated and interred at Slough crematorium.
After several fruitless searches over the years, I finally tracked down his memorial in the cemetery five or six years ago. I now always try to attend his final resting place on the anniversary of his birth (30 Dec) and death to tend the memorial and leave a token of respect (usually travelling there by Lotus). Yesterday would have been Mike's 87th birthday... RIP (sadly, Lynn died in 2022).