A 64-year-old man has been sentenced to life in jail with a minimum of 20 years for fatally shooting his former wife at her Port Hedland home last year.
Kenneth Malcolm Wood was sentenced in Supreme Court today over the murder of Amanda Wood in April 2013.
The court heard Wood had treated his victim's daughters, one of whom was home at the time of the shooting, like his own since the couple married in 2007.
The pair, who worked for the same mining company, separated in November 2012.
Ms Wood then entered into a relationship with another colleague before she and her youngest daughter moved in with him.
Wood was consumed by rage when he lost his job after his former wife made a complaint about him grabbing her arm at work.
On April 6, he waited for her in the front yard of her house before shooting Ms Wood in the right arm and abdomen about 6.30pm.
Justice Lindy Jenkins said while Wood claimed he was still in love with his victim, he had treated her like a piece of property.
She said she did not believe Wood had only intended to injure his former wife when he shot her.
"You came up to her and from two metres away you deliberately shot her twice," Justice Jenkins said.
"She no doubt suffered a very painful death"
After the shooting, Wood went to a police station and told the officer at the front desk what he had done.
The court was told he called his sister from prison on April 10 and told her he was aware of the consequences of his actions when he shot Ms Wood.
"Given the chance again, I'd probably do it again," he said.
"If I could have shot him as well I would have shot him as well."
Wood sent his victim and her boyfriend abusive messages in the lead up to her murder.
He took a rifle and a shotgun from under his housemate's bed on the day of the murder.
Mr Wood knew his former wife's daughter was in the house when he shot her mother as she arrived home from work.
Mr Wood's lawyer Ben Tyers said his client felt like Ms Wood had betrayed him when she reported her to his employer.
He said Mr Wood's perceptions of self-worth were linked to his job and he took the sacking hard.