Man denies intention to kill step-daughter

A Brisbane man who killed his step-daughter allegedly told a neighbour her would stab her if he could "get away with it" just weeks before her death.

Raymond John Mead has pleaded not guilty to murdering Sherelle Locke, 23, while she was watching TV with her mother in Boronia Heights in February 2014.

The Brisbane Supreme Court heard on Monday that Mead had been drinking heavily the day he pinned down Ms Locke and plunged a knife into her heart.

Prosecutor Jodie Woolridge told the trial that Mead detested Ms Locke and openly blamed her for the ongoing problems in his marriage.

Ms Woolridge said Mead told a neighbour just weeks before Ms Locke's death that if she stuffed up again she would "get what's coming to her".

"If I could stab Sherelle and get away with it I would," Mr Mead told the neighbour.

The court heard Mead initially denied stabbing Ms Locke and insisted to police that it was her mother and his then-wife Marlene Locke who did it.

But in a letter sent to Mrs Locke in January this year, Mead claimed he accidentally stabbed his step-daughter when Mrs Locke pushed him.

"I wasn't going to stab anyone," the letter said.

Ms Woolridge said a pathologist would testify that the 27cm deep wound to Ms Locke's chest was unlikely to have been the result of someone falling on her.

The trial continues.