An inmate posted gloating prison selfies on Facebook while serving a life sentence for murdering a 16-year-old boy.
Lee Firman was caged for killing Glen Corner on the night the teenager was celebrating his 16th birthday.
Glen, who had also passed his GCSEs that day, was stabbed twice by thug Firman.
Brave Glen was left in a pool of blood after trying to protect a friend after being stabbed.
Firman, then of South Shields, was given a life sentence with a 16-year minimum limit after admitting murder.
But the killer has flouted strict laws forbidding the use of internet access behind bars and has created a Facebook profile.
In pictures posted to the page – which have since been deleted – a grinning Firman is snapped next to another lag putting his thumbs up to the camera as well as a grinning selfie.
The arrogant killer has left Glen’s mum, Susanne Hilton, distraught.
She told Chronicle Live : “It’s made me angry that he is cheating justice. One of the pictures I have seen is from the prison recreation room, and he is sitting there with his thumbs up.
“It’s the first time I have seen his face in 10 years and it made me physically sick. I am devastated.
“Some of the people on this man’s friends list were friends with my Glen and they are friends of mine.
“He could have been looking at pictures of my children, and this has made me relive the entire thing. My children are terrified. What happened is not fair and it’s not fair I have to keep going through this.
“Something needs to be done. I feel let down by the system.”
Susanne, 43, and children Evan, 22, Nathan, 19, Matthew, 14 and 13-year-old Sarah, still live a short walking distance from where Glen was murdered on August 25 2006.
Glen dreamed of being in the army and on the day he celebrated turning 16 he also found out he had passed his GCSEs.
But thug Firman had gone out armed with two kitchen knives to confront a rival among Glen’s group of friends.
After Glen tried to protect his pal, Firman attacked him on South Shields’ East Avenue.
Despite desperate efforts to save his life by the teen’s friends, and medics at South Tyneside Hospital, nothing could be done to keep Glen alive.
Susanne said: “It still hurts, it won’t go away.
“I have flashbacks to the night I lost my son and I have PTSD. I am stuck in this area where everyone knows what happened.
“That night is clear as a bell in my mind, I have to re-live it every single day. Sometimes I cannot bear to leave the house. Even now if I hear an ambulance siren I start panicking.
“I have to live with it every day of my life.
“I remember two of Glen’s friends coming to the door, covered in blood. They told me Glen had been stabbed. Someone drove me to the scene and I can see all of the flashing lights now. It is still too painful to talk about.”
After Glen’s murder, Susanne set up the Glen Corner Trust to help other families torn apart by knife crime.
And 11 years on from his death, Glen’s memory lives on.
She said: “He was a good boy. He had a group of friends and they were all mountain bike mad. Glen was really loving and was a fantastic son.
“I still miss him every day.”
A Prison service spokesperson said: “This behaviour is unacceptable. We have requested that this social media profile is removed and the prisoner involved will be disciplined, which could mean extra time behind bars.
“We are stepping up measures to find and block mobile phones in prisons and those found with them can face extra time behind bars.”