Killer son smirks as family reveal pain over man's horrific death

A man has admitted in court to stomping his father to death in a vicious and relentless attack.

Victorian man Mark Missen’s body was then dumped down a disused mine shaft.

His killer son Nathan smirked in court as family member spoke of their pain.

Nathan Missen broke his father’s jaw, put a pillow case over his head, stomped on his face and then strangled him to death with a belt.

The attack allegedly occurred because Mark Missen had wanted to check if his son’s girlfriend was OK after Nathan had bashed her.

After the fatal attack, his son then asked for his friends to help dump his father’s body in a disused mine shaft.

Mark’s sister Cheryl is still haunted by the tragedy.

Father Mark Missen was fatally attacked by his son Nathan. Source: 7News

“To know that Mark called out ‘I can’t breathe’ and for Nathan to not call an ambulance is unbelievable and absolutely heartbreaking,” she said.

“I have ongoing nightmares about how Mark must have felt when his only son was killing him.”

“I was devastated,” sister Diane said.

“I will never see my brother again.

“I could not believe anyone could do that to another human being.”

She thought her brother was missing, then saw news of a body being found, she said.

“They showed a piece of clothing and I knew it was Mark, because I gave him that T-shirt,” she said.

“I felt sick.”

Nathan Missen broke his father’s jaw, put a pillow case over his head, stomped on his face and then strangled him to death with a belt. Source: 7News

The court heard the father and son shared a turbulent relationship and both suffered from mental illness.

A month before the murder, Nathan went missing and the person who was most worried was his father.

For days Mark desperately searched for his son, going to two police stations for help.

Four weeks later Mark was dead.

Nathan Missen has pleaded guilty to murdering the man he says was his “best mate.”