Former NSW Police officer Beau Lamarre-Condon has told a Supreme Court judge that he "will not be silenced" and declared "the truth will prevail" as his trial over the alleged murders of Sydney couple Jesse Baird and Luke Davies was set down for next September.

The 30-year-old had already pleaded not guilty to all charges in the Local Court but on Friday used his arraignment in the higher jurisdiction to make an unprompted outburst before Justice Peter Hamill.

Mr Lamarre-Condon is accused of shooting Mr Baird and Mr Davies with his service firearm at Mr Baird's home in Paddington, in the city's east, in February last year.

After confirming the pleas of not guilty to two counts of murder and one count of aggravated break and enter, Mr Lamarre-Condon, appearing via audio-visual link, told

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