A central Queensland meatworker has been sentenced to life in jail for killing his friend by chopping his head off in a rage over his wife's affair with the deceased's brother.

Key points: Khan had pleaded not guilty to Mr Alam's murder

Khan had pleaded not guilty to Mr Alam's murder In sentencing, Justice Graeme Crow described the murder as truly shocking

In sentencing, Justice Graeme Crow described the murder as truly shocking Khan cried and interrupted the judge as he was sentenced to life in jail

Mohammed Khan was this morning found guilty in the Supreme Court trial in Rockhampton of the murder of 33-year-old Syeid Alam.

The trial heard Khan had arranged to go fishing with his friend and co-worker, Mr Alam, the night he disappeared in 2016.

Mr Alam's headless body was found on the banks of Rockhampton's Fitzroy River in April 2016, 11 days after he went missing.

The victim's head was found nearby, wrapped in jeans.

A small axe was also found in the area a day later.

Khan had pleaded not guilty to Mr Alam's murder and has been in custody since May 2016.

Although the sexual affair between Mr Alam's brother, Sha Alam Sha Alam, and Mr Khan's wife, Suparti Suparti, ended seven weeks earlier, Mr Khan became violent when the issue of naked photos of Ms Suparti was brought up, the court was told.

Crown prosecutor Joshua Phillips previously told the court highly probable mobile-tower-location data and traffic-camera footage placed Khan at the "kill zone" on the night of the murder.

"Who else has been shown to have plans that night with Syeid? he said.

"Who else has been shown to have left their home at the right time to be the killer?

"Who else has been shown to have a strong motive, a strong motive for dispatching the older brother of the man who slept with his wife … the mother of his young kids."

The jury had heard Mr Alam had gambled over card games at his accused killer's home prior to his death with others from work and their friendship group.

The victim's wife testified that Mr Alam had been gambling up to $3,000 per week, leading him to tell her in December 2015 he was unable to financially support the family.

Ferdous Ferdous testified her husband Syeid Alam had been gambling up to $3,000 per week ( ABC News: Jemima Burt )

'Truly horrendous'

In sentencing, Justice Graeme Crow described the murder as truly shocking.

"You've had a difficult personal history, you've been offered a new chance at life in this country and you were prior to this offence working in Rockhampton and contributing to this community," Justice Crow told the court.

"However, the murder of your close friend is truly shocking.

"The medical evidence in this trial shows it was a stealth attack, with no injuries shown on the corpse other than to the neck.

"The beheading of any human being is truly horrendous.

"You have taken the life of Syeid Alam with great impact on his family."

Justice Crow said Mr Alam's wife Ferdous Ferdous now "has understandable psychological problems [and] she has had difficulties with her visa without a provider in her family".

"Two of the eldest sons of Ferdous Ferdous and Syeid Alam miss their father every day," Justice Crow said.

"Their youngest son does not know his father.

"Ferdous Ferdous is very lonely, very sad, and has had a terrible life since the loss of her husband."

'System has betrayed me'

Khan cried and interrupted the judge as he was sentenced to life in jail.

"You have betrayed us because I am an outsider," Khan told the hearing.

"I know it is shocking but the system has betrayed me just because I am a foreigner — there was no evidence, there was nothing to prove that I was guilty — I don't know how you proved that."

Khan's defence told the court he had a difficult past, taken into forced labour by the Myanmar army 20 years ago before fleeing to Bangladesh and Malaysia, before arriving to Australia on a boat that took seven days to arrive.