A former NSW detective has been charged with the murder of a missing Sydney university student and police also want to speak to disgraced detective Roger Rogerson over the disappearance.

Glen McNamara, 55, who was stationed at Kings Cross during the late '80s, was charged with the murder of Jamie Gao early on Monday.

Wanted for questioning: Roger Rogerson. Credit:Janie Barrett

Police are now searching for Mr Rogerson, an associate of Mr McNarama, to question him in relation to Mr Gao, 20.

NSW detectives are flying to Queensland on Monday to talk to Mr Rogerson.