The looming inquiry into David Harold Eastman's murder conviction has been set to begin in March.

Acting Justice Kevin Duggan's informed an ACT Supreme Court directions hearing on Wednesday that the broad-ranging inquiry would proceed on March 4.

Eastman is locked up awaiting the fresh probe into his 1995 conviction for the murder of Australian Federal Police assistant commissioner Colin Winchester.

Winchester was gunned down in his neighbour's driveway in January 1989. 

A jury convicted Eastman of the slaying, and he was sentenced to life behind bars.

Eastman has served 17-years of the sentence but has always maintained his innocence.

A broad-ranging inquiry was ordered by Justice Shane Marshall in August last year.

The judge was satisfied there was ''fresh doubt or question'' about Eastman's guilt, and ordered the inquiry based on 19 wide-ranging grounds proposed by Eastman's lawyers. 

They canvas mental health issues, forensic evidence and the conduct of the prosecution and investigating police.

The ACT Government in November pledged $2.514 million for the inquiry.