On Monday, West Australian Supreme Court Justice Bruno Fiannaca said Ms Yusuf’s final words only demonstrated her horror, betrayal and desperation to stop her husband, Ahmed Dawood Seedat, 37.
Ms Yusuf, 32, woke up after the first blow but was vulnerable and easily overpowered by him as he continued his attack, Justice Fiannaca said.
He buried his wife in the backyard of their Perth home that had been made by a contractor who was told it was to install a pool for his children, aged two and five.
The accountant, who pleaded guilty to murdering his wife at their Carlisle home on August 31, 2018, wept as he was sentenced to life behind bars on Monday.
Seedat had claimed his wife became “sexually aggressive”, prompting him to attack, but Justice Fiannaca said that was implausible.
He said Seedat planned the murder for weeks and had egotistical motives.
He had intended to try to pursue a relationship with his sister-in-law, who he described as his best friend, but she viewed him as a brother.
“You envisaged a future with your sister-in-law … you had become emotionally dependent on her,” Justice Fiannaca said.
Seedat had searched online: “Can you marry your brother-in-law if your sister is dead Muslim?”
Justice Fiannaca said Seedat had also searched online for chilling terms such as “cremating a body”, “best place to knock someone out” and “burying someone alive”.
He said Seedat struck his wife of eight years with a wheel brace, then choked or suffocated her in bed.
Seedat claimed her final words were that she loved him, but Justice Fiannaca said that only demonstrated her horror and desperation to stop him from killing her, and the betrayal she felt.
Ms Yusuf’s cause of death remains undetermined but Justice Fiannaca said she suffered lacerations to her head and body, and had sand in her mouth but not in her airways.
After Ms Yusuf’s death, Seedat lied to explain her absence, telling friends and neighbours she went to the UK for eye surgery and telling her sister she left him.
Seedat also asked a friend to call Ms Yusuf’s interstate father and impersonate a police officer.
Justice Fiannaca said it was part of Seedat’s narcissistic traits that he thought people would believe his lies and he could get away with the crime.
“It may have been technically clumsy but it was calculated behaviour,” Justice Fiannaca said.
Ms Yusuf was reported missing four days after her death and police found her body the following day.
Justice Fiannaca said Seedat had deprived his children of both their parents, but accepted he was remorseful.
Seedat is separately facing fraud charges, with allegations he stole $5.7 million.