Known only as C12, the officer tells a Channel 4 documentary: "I will have to live with it for the rest of my life.
"Everything told me that I was going to die." Brazilian electrician Mr de Menezes had been followed from his flat to Stockwell station in South London on July 22, 2005, by surveillance officers.
They had mistaken him for a suspect in failed terror attacks the previous day, with the city on high alert just two weeks after the July 7 bombings killed 52 people.
C12 and a colleague known as C2 had orders from Gold Commander Cressida Dick, later Met commissioner, to stop him getting on a train.
The officer is not named but appears on camera in Shoot To Kill: Terror on the Tube talking for the first time about the operation.
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber ? Sign In
This story is from the {{IssueName}} edition of {{MagazineName}}.
Start your 7-day Magzter GOLD free trial to access thousands of curated premium stories, and 9,000+ magazines and newspapers.
Already a subscriber? Sign In
FIN IT TO WIN IT
Baxter hoping to end his dismal run of defeats in Red Rose shirt
HE'S LIGHTING UP THE JUNGLE AND IN 1985 BARRY MCGUIGAN LIT UP THE SPORTING WORLD
THE 'Clones Cyclone' was not just a revered fighter but a man who had brought Irish communities together.
Time and Stace...
Stars' new pic for final episode
£230m heir killed pal in knife frenzy
Jury find him guilty of housemate's murder
FURY AS WATER BOSS KEEPS £195K BONUS
Payout comes despite Ofwat block and as sector splashes £1bn in dividends
Amy Dowden inspired me to do CoppaFeel! Himalayas trek ..and to get fit
When Dragons' Den star Sara Davies said she had a mountain to climb as part of her fitness drive she was not speaking metaphorically.
Busiest station stays on track
Lizzie Line boosts numbers using railways
I AM DON
TV Ellen 'moves to UK' after Trump's victory
Yobs facing two years jail over 'respect orders'
Labour bid to reclaim streets
BERT ALERT
Storm dumps snow and rain