they didn't. they died
No, George Mallory and Andrew Irvine were not murdered while on Mount Everest in 1924. George Mallory fell to his death, his body was found in 1999. The body of Andrew Irvine has never been found so it is not clear how he died.
yes
There has been no real evidence to show that Mallory and Irvine did or did not make it to the summit of Mount Everest. Everything that you read about it is the writers own idea and theory to what had happen. If the body of Irvine is found and the camera is with him it 'might' show how far they really got.
Noel Odell spotted Mallory and Irvine high up on Mount Everest. He was the last person to see them alive.
Andrew Irvine was skilled with his hands, mending things. George Mallory choose Irvine because of this skill, he could sort out any problems with the oxygen apparatus.
The only people Mallory and Irvine saw while climbing on Mount Everest were there team mates, there was no one else on the mountain
When George Mallory and Andrew Irvine were high up on the slopes of Mount Everest in 1924 they did not pass anyone. They were the highest people on the mountain at the time.
Sandy Irvine and the geographer Odell the only one who survive.
Sandy Andrew Irvine and the geographer Odell
In 1999 the body of George Leigh Mallory was found high on the North Face of Everest by Conrad Anker, a member of a team searching for Mallory and Irvine
George Mallory and Andy Irvine.
There are many articles about the mystery of Mallory and Irvine's last climb on Mount Everest. Read the 2 articles at the links given.