Spencer Matthews haunted by image of brother being left to die alone on Mount Everest

Michael Matthews disappeared on Mount Everest in 1999, when his younger brother Spencer was just 10 years old.

Now, 23 years after his big brother's tragic death, Spencer has embarked on the mission of a lifetime, a quest to retrieve Michael's body from Mount Everest.

Michael's body was never found, but it is believed that he is one of the 310 people who died attempting to climb to the summit.