DNA samples lifted from a balaclava, a water jug and a milk bottle are key to identifying who killed Irma Palasics, according to the prosecution. And the jury is now being shown what was found.

However, a lot has changed in forensic pathology over the past 25 years, making it a tough job for the biologist giving evidence in the trial.

If you have any questions you'd like Liz, James and Stocky to answer in future episodes, please email thecaseof@abc.net.au.

The Case Of is the follow-up to the hit podcast Mushroom Case Daily, and all episodes of that show will remain available in the back catalogue of The Case Of.