There were quite a few heroes in the movie who bit the dust and the "Did Thanos Kill Me?" site determines ... you explain the moment when he saw young Gamora at the end of the movie?

Gamora's scan reveals that she is the last surviving member of her people. The Last. Surviving. Member. Which means that Thanos, even if he did only kill half the population, succeeded in wiping ...

“Kill them,” Thanos yells ... Of course I could see the face of Death.” “Did Thanos make Gamora who she is, or was she always the deadliest assassin in the galaxy?” ...

but once Star-Lord went off book after learning Gamora was dead, everything went to hell. Thanos did threaten to kill Iron Man, but that was only so Doctor Strange would hand over the Time Stone.

It’s a beautiful ending for Drax that wouldn’t have happened if he had been the one to kill Thanos ... Gamora potentially felt just as much regret about not being the ones to end him as Drax did.

He threw Gamora to her death, and not even the Infinity Stones can turn back a Soul Stone sacrifice, so she did not return to life with the rest of the people who had been killed by Thanos’ snap.

The said incident occurred long before Thanos’s daughter became one of the Guardians of the Galaxy. Gamora did not reveal where or how she found the location of the stone to anyone except her ...

Gamora's scan reveals that she is the last surviving member of her people. The Last. Surviving. Member. Which means that Thanos, even if he did only kill half the population, succeeded in wiping ...