The daughter of underworld figure Nabil Maghnie and a man believed to be his son were ejected from Love Machine before a fatal double shooting outside the nightclub, a special court hearing has revealed as police try to build a motive for the killings.

The information was released during a compulsory examination in the Melbourne Magistrates Court on Monday, when two men linked to the Prahran nightclub were compelled to give evidence after repeatedly refusing to assist police.

Security guard Aaron Osmani and patron Richard Arow were fatally shot outside Love Machine on April 14 this year.

Aaron Khalid Osmani and Richard Arow died as a result of the Love Machine shooting.

Mr Maghnie's son, 18-year-old Jacob Elliott, was charged in June with murder, and attempting to murder three other men. Another man, Allan Fares, 22, also faces two counts of murder and three of attempted murder, while Moussa Hamka, 25, has been charged with being an accessory after the fact to murder and assisting the principal offender. None of the accused have entered a plea in relation to the charges.