THE BOMBING OF THE NCA OFFICE IN ADELAIDE:
* On March 2, 1994, a parcel bomb exploded in the office of the National Crime Authority on the 12th floor of an office building in Waymouth Street, Adelaide.
* The blast killed investigator Detective Sergeant Geoffrey Bowen and severely injured lawyer Peter Wallis.
* The bombing has been one of South Australia's highest-profile cases, with a $1 million reward offered in 2008 for information leading to the conviction of the person or people responsible.
* Dominic Perre was first charged with murder soon after the bombing but the case against him was dropped six months later because of a lack of evidence.
* The 63-year-old was arrested again in 2018 after a joint investigation, lasting more than two years, by a number of state and federal authorities including the Australian Criminal Intelligence Commission.
* He now faces charges of murder and attempted murder and is being held in custody after recently being jailed on drug trafficking charges unrelated to the bombing.
* His defence team recently told the court he is suffering from a range of serious health issues including diabetes and high blood pressure.
* The Supreme Court trial is expected to last several months and will be presided over by Justice Kevin Nicholson.
* There will be no jury after Perre elected to be tried by judge alone.
* The first few weeks of the trial will be taken up by legal argument over the admissibility of prosecution evidence.
* Perre's defence will be led by Gilbert Aitken, with Sandi McDonald SC arguing for the Crown.
* Few details have been revealed relating to new prosecution evidence against Perre.
* In earlier hearings, his defence said the only new material against him related to a "conga line of informants".
* However, in entering not guilty pleas in Adelaide Magistrates Court, it was conceded he had a case to answer.