A bid to avoid retrial by David Harold Eastman is expected to be heard in February.
Meanwhile, a decision on whether to further relax the murder accused's bail conditions will be delivered on Friday.
Acting Justice David Ashley, QC, on Thursday set a new timeframe for proceedings after the matter hit a number of delays caused by illness, legal process, and the hunt for a judge.
Eastman is accused of the 1989 assassination of Assistant Federal Police Commissioner Colin Winchester.
He served 19 years in jail for the murder, until an inquiry found his 1995 trial had been a miscarriage of justice.
Eastman's conviction was subsequently quashed and the prosecution announced it would pursue a retrial.
Eastman has launched a stay application to halt the retrial on the grounds he will not be able to get a fair hearing.
The application was due to be heard last month but has been put on hold after ill health forced defence counsel Christopher Boyce, SC, to withdraw.
Eastman also successfully had Acting Justice Anthony Whealy removed from hearing the stay application, further delaying the matter and sparking a hunt for a new judge.
In July, Acting Justice Ashley – a retired Victorian judge – was appointed to oversee the stay application.
During a lengthy sitting in the ACT Supreme Court on Thursday, the judge told both the defence and prosecution that parties needed to focus on progressing matters.
A sticking point between the parties has been the availability of evidence before the stay application.
Eastman's legal team argues the application should be delayed until the defence is shown the entire prosecution case.
Defence counsel Mark Griffin, QC, asked that the judge set a cutoff date after which time the prosecution could not add further evidence to the case.
The silk said it would be unfair to mount a stay application when the full prosecution case was unknown.
But the prosecution says the continued collection of evidence – including forensic tests overseas – should not delay the stay application.
Prosecutor Keegan Lee it would be extraordinary for a judge to prevent the Crown from adding to its case.
Mr Lee said prosecutors could never guarantee material would be added or subtracted from a case.
"Things will always come up unexpectedly," he said.
Acting Justice Ashley reserved his decision on the cutoff date.
The defence also applied to have Eastman's final two bail conditions – reside and report – deleted.
Mr Griffin said after more than one year of freedom the conditions no longer provided any utility and caused confusion.
The judge will hand down his decision on the bail variation on Friday morning.