The mother of Fusilier Lee Rigby has said she feels a "constant pain every single day" following the brutal murder of her son three years ago.
The 25-year-old soldier was stabbed to death outside the Royal Artillery Barracks in Woolwich, south London, in July 2013 while off duty.
Lyn Rigby, 49, told the BBC that she still struggles with the loss of her son and called for more support for bereaved families.
She said: "The pain never goes away. It's constant pain in my chest every single day.
"Before, I was a bubbly person. I lived for my children and wanted everything for them. If they were happy, I was happy.
"But to have one ripped away, a part of you goes with them. It will never be the same again."
Fusilier Rigby's killers, Michael Adebolajo and Michael Adebowale, were sentenced to life in prison in December 2013 after they were found guilty of his murder.
Mrs Rigby, of Middleton, Greater Manchester, has since set up the Lee Rigby Foundation as a way "to honour" her son and to help other bereaved families.
The mother-of-five said: "The idea is to help bereaved families of those who served in the armed forces. We never had much to help when Lee was murdered. It is a way to honour Lee and he would be very proud."
In the interview, to be aired on BBC Radio 5 live with Sarah Brett on Thursday afternoon, Mrs Rigby reads out the text which her son sent her on Mother's Day.
It reads: "Goodnight Mum. Hope you had a fantastic day today because you are the most fantastic one-in-a-million mum anyone could ever wish for. Thanks for supporting me all these years. You are not just my mum. You are my best friend. So goodnight Mum, I love you loads."
Mrs Rigby ends the reading by tearfully saying: "I'd give anything to have him back right now. I miss him so much."