A Thai woman found guilty of killing her Canadian husband was sentenced to life in prison on Friday along with two others.

Dale Henry, of Calgary, was found murdered in his bed in February of last year in Ranong province.

Henry's family alleged he was killed for a life insurance policy that was set up in his wife Manareet Henry's name.

Manareet, along with her ex-boyfriend Amornsak Keskaow and gunman Jinda Sae Tae, were originally sentenced to death for pre-meditated murder.

The sentences were reduced to life in prison, however, after they co-operated with police in the investigation.

In a statement, the court said the police investigation revealed that all three plotted to kill Henry, 48, for the $1 million policy provided by his employer in Thailand, Noble Drilling.

The majority of the planning was done by Manareet and Keskaow.

According to documents she sent a text message to Keskaow at one point asking him to hire a shooter, saying Henry often became physically and verbally abusive after drinking.

Jinda Sae Tae was then recruited to join in the plot, documents said.

According to Thai authorities, Maneerat waited until her husband had fallen asleep in front of the television at their home 460 kilometres southwest of Bangkok.

She then sent a text message her co-conspirators.

Police say Henry was shot at close range in his bed while he desperately struggled to get away.

"I know he was shot and he put his hands up to block it," Henry's niece Charmaine Von Der Ahe told CTV Calgary at the time of his murder. "They found shots through his hand and into his head."

The Calgary man and his wife had been married for six years after meeting while he was working as a bartender in Koh Samui, Thailand.

Despite the 20-year age difference, Henry told his family he believed he had found true love.

Henry, who grew up in Victoria, B.C. and had done stints as both a paramedic and firefighter, had been working in Nigeria as regional head of safety for Noble Drilling. He would spend three months working in Nigeria, followed by a month with his wife in Thailand.