Pratt, 43, was charged last month with the murders of elderly couple Kenneth and Margaret Keyte.

Police requested hair and cheek cell samples as well as measurements of Pratt's weight, height, leg length and arm length.

A post-mortem examination revealed Mrs Keyte died with a dark-coloured hair in her hand, which may have belonged to her killer.

A document tendered to the court said Pratt's fingerprints were found in blood stains at the Keyte's home.

The couple were killed by blunt force trauma to the head, which investigators believed was inflicted by a lounge chair that was found bloodied near the victims.

See the full report in Tuesday's Mercury.