A Queensland man has been sentenced to life imprisonment after being found guilty of murdering a pregnant McDonald's worker more than three years ago.

A Brisbane Supreme Court jury on Monday convicted Andrew Michael Burke of 27-year-old Joan Ryther's rape and murder, as well as killing her unborn child at Logan Central in May 2013.

Justice Debra Mullins sentenced him to a head term of life imprisonment for murder, opting not to alter the standard 20-year non-parole period despite prosecution submissions based on the viciousness of the crimes.

It came after Mrs Ryther's husband, Cory Ryther, gave an impassioned victim impact statement to the court in which he described the "inhuman act" that robbed him of his wife and unborn child.