West Australian Nicolau Francisco Soares, 28, is alleged to have killed Dr Delys Weston and Professor Gavin Mooney at their Mountain River property in December 2012.

Mr Soares pleaded not guilty to murdering the two academics in the Supreme Court in Hobart yesterday.

The court heard that the Crown and defence counsels agreed on most facts to be provided as evidence in the double murder trial.

Prosecutor Linda Mason said it was understood that an insanity plea would be raised in Mr Soares's defence.

"The Crown certainly doesn't take issue with the fact Mr Soares had a mental illness and that it was a live issue active at the time that this occurred," Ms Mason said.

Justice David Porter was told that witnesses would be called to give evidence about the accused's mental health, including at least one psychiatric expert.

"It's really a matter for the jury to decide on the balance of evidence as to whether (the accused) knew the acts he was doing were wrong," Justice Porter told the court.

Ms Mason said two triple-0 calls would be played to the jury; one lasting 25 seconds and the other 13 minutes.

A video "walk-through" of the alleged murders would also be played in court.

Justice Porter was informed that a series of photographs would be submitted as evidence, including some taken at autopsies of the two victims.

"Potential jurors will need to be warned against the nature of some of the photos," Justice Porter said.

The trial has been adjourned until 10am Monday.