You wouldn't know Tyler Kinghorn was the victim of a brutal, vicious attack by looking at him.

His scars are hidden, but he suffers from memory loss, temperament issues and anxiety.

The man who randomly beat Kinghorn — stomping on his head while he lay on the concrete at Cowboys parkade in December 2012 — was sentenced to 15 months in jail in a Calgary courtroom on Thursday.

"Part of me thinks that it's not fair, that he should get longer," said Kinghorn. "He needs a kick in the ass to get his life together."

Addison Joseph Hartzler pleaded guilty to assault causing bodily harm in April.

Addison Joseph Hartzler

Addison Joseph Hartzler pleaded guilty to assault causing bodily harm for attacking Tyler Kinghorn in 2012. (Court exhibit)

Hartzler and some of his friends followed Kinghorn and his girlfriend from Cowboys into a nearby parkade. The victim testified Hartzler whispered to him, "I'm going to rape your girlfriend."

Then he began the attack, kicking and punching Kinghorn. Eventually, one of Hartzler's friends joined in the attack. Once he was down on the ground, Hartzler stomped on Kinghorn's head three times.

When he was "satisfied that he had done sufficient damage," and Kinghorn lay unconscious on the ground, the attackers left.

Paramedics would arrive to find the victim bleeding from his ears. He vomited while en route to hospital and a CT scan would reveal a severe brain bleed.

Now, Kinghorn says he suffers from headaches and has lost his sense of emotion. 

Still, the 22-year-old is working hard to move on, and forgiveness is part of that process.

"He's got potential," said Kinghorn of his attacker. "He did look me in the eye. He did apologize."