Inside shocking cover-up of MI6 spy who executed wife 

Major William Mackinnon Gray sat in a cell at Winchester jail, awaiting the hangman’s noose. His wife lay dead, killed by a bullet to the temple from his revolver.

What the public never knew was that Gray was actually a disgraced ex-MI6 officer, whose misdeeds had already been covered up at least once before.

And while the hangman was assigned a date to bring an end to the disgraced soldier’s life, his execution never took place.

Gray's sentence was quickly commuted to life in prison and then, in secret, just seven years later, he was freed to live in exile.

The night before the shooting, the couple had stayed up into the early hours discussing their money problems. They owed at least £300 — around £16,000 in today’s money.

After hearing Gray had murdered his wife, consternation pulsed through the upper echelons of MI6 over the risk of his secret service work being exposed.

Gray’s Prison files were due to remain sealed until 2049, but The Sun was able to reveal the true story through a Freedom of Information request, as most of those in the story ar

Inside shocking cover-up of MI6 spy who executed wife