Michael Given’s sister Nikki said Matthew Pope’s “horrific” actions had robbed their family of a perfect brother and son.
The 22-year-old was convicted of murdering Mr Given in his Lochee flat following a two-week trial at the High Court in Aberdeen.
She said: “He’s a butcher by name and a butcher by nature. He doesn’t understand how devastated he has left our family.
“Michael couldn’t even defend himself. He attacked Michael when he was in his boxers, it’s disgusting. Michael didn’t have a chance.”
“Even though justice has been done, it’s never going to bring Michael back.”
Mr Given’s friends and family endured days of harrowing evidence during the trial, with his mother Angie leaving the courtroom in tears on many occasions.
Miss Given said: “It was horrific. We knew Michael was murdered but we didn’t know it was that brutal.
“Some of it was too distressing for my mum. I think it was just seeing all of Michael’s injuries.”
Miss Given said if she came face-to-face with her brother’s killer she would call him a “monster”.
She said: “I hate that boy for what he’s done to us. I don’t understand how he put us through a trial.
“He could have ended this way back and just pled guilty from the start.”
Miss Given said life would “never be the same” for her family.
“Everybody says their family is perfect, but Michael really was perfect. Matthew Pope was not his mate, like he claimed.
“Michael fed all his friends and gave them money and electric, he gave them everything.
“My mum is broken. Michael was just a mummy’s boy. My mum said that you don’t give birth to a son to have him snatched away later like that.
“Everybody else gets on with their lives and we’re just stuck. It’s not natural having to move forward without Michael so I don’t think we can.”