Thomas Lang found guilty of murdering former model Maureen Boyce at Kangaroo Point

A retired American doctor has been found guilty for the second time of the stabbing murder of former model Maureen Boyce in her Kangaroo Point apartment in 2015.

The Supreme Court jury in the retrial of Thomas Lang deliberated for two days before reaching a guilty verdict on Monday afternoon.

Lang, 68, was accused of murdering his on-again-off-again lover by stabbing her several times in the abdomen with a large kitchen knife while she was laying in her bed.

He pleaded not guilty with his defence team suggesting Ms Boyce took her own life.

Lang was first found guilty of the offence in 2017, but his murder conviction was quashed after the Court of Appeal found some evidence in the original trial may have been misleading and irrelevant.