Richard Mdluli's defence attorney has started listing details of the alleged plot against the former head of the police's crime intelligence unit.
An inquiry into the death of Vosloorus man Oupa Ramogibe is underway in the Boksburg Magistrate's Court.
Mdluli was charged with the crime, but charges were withdrawn in February pending the outcome of the inquiry.
The court has heard how there were parallel investigations being conducted by the Hawks and regular detectives into the murder of Ramogibe.
Ramogibe was romantically involved with Tsidi Buthelezi, the mother of one of Mdluli’s children.
Mdluli's lawyer Ike Motloung referred to a detectives docket, with a note dated March 2011, which found that the matter was undetected.
Head of Detectives Godfrey Lebeya explained that "undetected", in police terms, means a suspect could not be found.
Motloung told the court that in late 2010, the Hawks were conducting their own investigation and that this probe led to Mdluli's arrest.
Lebeya could not explain the parallel investigations, adding that the undetectable note on the one docket was questionable.
Mdluli has maintained he is the victim of a plot to oust him as head of crime intelligence.
Questions have been asked over the sudden resurrection of the ten-year-old murder investigation.
Magistrate Jurg Viviers told the court that in his entire career as a presiding officer and prosecutor, he had never seen a docket make a comeback with such force.
He asked Lebeya why the Ramogibe case was resurrected after being dormant for a decade.
Lebeya said police were just doing their duties.
The outcome of the murder inquiry will decide whether charges are reinstated against Mdluli and his three former three subordinates.