Defence minister Tobias Ellwood has said not a day goes by without him thinking about the police officer whose life he tried to save during the Westminster terrorist attack.
Mr Ellwood, who served in the Royal Green Jackets, ran towards gunfire and gave mouth-to-mouth resuscitation to PC Keith Palmer, who was stabbed in March's attack by Khalid Masood.
He was pictured pumping the police officer's chest, with blood on his face and clothes, as he tried to help amid the carnage, but PC Palmer died from his injuries.
His comments came during a Westminster Hall debate on compensation in the armed forces, as MPs praised the former soldier for his efforts during the tragedy.
Mr Ellwood, who has been branded a hero, said:
"It was a very difficult day for me. Not a day goes by when I don't think about PC Keith Palmer.
"The toughest part of that day for me after that was going home and finding my eight-year-old boy on the top of the stairs, unable to sleep and wanting explanations about what happened that day.
"All I could offer was that there are occasionally some very bad people that do very bad things, but there are always some very good people that are doing even more good things.
"On that day I was one of a number of people trying to do a good thing."
It is not the first time Mr Ellwood's life has been touched by an atrocity. His brother Jonathan was killed in the 2002 Bali bombing.
The Queen gave permission for PC Palmer's body to rest in Westminster's Chapel of St Mary Undercroft, an honour normally reserved for heads of state.
PC Palmer was an unarmed police officer who had served as a soldier in the Royal Artillery.
The 48-year-old father and husband was a member of the Parliamentary and Diplomatic Protection Squad and was stabbed as he tried to stop the attacker entering Parliament.
Four other innocent people were killed and dozens of others injured in the 82-second atrocity on March 22, which ended with Masood being shot dead.
Scotland Yard said Masood was not the subject of any investigations and there was "no prior intelligence about his intent to mount a terrorist attack".
However, he was known to police and MI5 and had convictions for assaults, including GBH, possession of offensive weapons and public order offences.
Masood was born in Kent on Christmas Day in 1964 and detectives believe he was most recently living in the West Midlands. He was also known by a number of aliases.
Photo courtesy of Facebook/Staci Martin and City Police