The recent movie Arthropod IMHO did a good job of sticking to the true story of Heydrich’s assassination. I always had the impression that Heydrich would have survived the assassination if he had just cut and run, BUT NO he thought he was invincible, stopped the car and fought with his pistol.
He got the wrong end of a IED and died from septic wounds. Too bad he couldn’t suffer longer like ol’ Stalin, leeches and all.
/rant
There’s some speculation that Heydrich made a deathbed confession where he expressed regret for what he’d done.
Not many Nazis shed a tear when Heydrich passed, he was the one who had the dirt on all of them, and he was Hitler’s favorite, so he was untouchable. Hitler basically told Himmler, if anything happened to Heydrich, at the hands of another Nazi, Himmler wouldn’t last more than 24 hours. Some speculation that Heydrich could have been Hitler’s successor.
That he did. The Doc who let it happen was one of Himmler's personal doctors, and subsequently ran experiments in wound sepsis on human subjects in Dachau to try to exonerate himself.
The may or may not have named Operation Reinhardt after him - note the "t" at the end which was not actually in his name, leading most scholars to suspect that it was actually a coincidence. You may have heard of the extermination camps that were a part of this: Treblinka, Sobibor, Belzec, and Majdenec. He deserves that hideous legacy even if it wasn't named after him, because he was there at the Wannsee conference when it was all planned.