Lonesome George is the last remaining Galapogos Pinta tortoise, his species died out because of humans killing them - simple as. No, it really is that simple because there are no predators on Galapogos.
Lonesome George is currently about 170, and is one of the oldest creatures on Earth (the oldest is currently another tortoise at 175). Nobody is quite sure when (or if!) he will die because he's the only survivng example of his species.
The Galapagos Islands.
Lonesome Sundown died on 1995-04-23.
The final words in "Lonesome Dove" are "when I die, I'll die a free man on my own land."
Georges Demenÿ died in 1917.
Georges Kopp died in 1951.
Georges Gardet died in 1939.
Georges Cipriani died in 2006.
Georges Nagelmackers died in 1905.
Georges Gaudy died in 1940.
Georges Merle died in 1886.
Georges Poitou died in 1989.
Georges Friedmann died in 1977.