NSW police are reportedly investigating convicted killer Simon Gittany over business dealings with two methylamphetamine producers.

Gittany was on Wednesday found guilty of murdering his fiancee, Lisa Cecelia Harnum, by throwing her off their high-rise apartment balcony in a fit of uncontrollable rage.

News Corp Australia has reported that a series of payments between convicted drug dealer Gittany and two others are being investigated.

With the trial over, several news outlets have published details of Gittany’s violent criminal history.

The most graphic was revelations of how the then 20-year-old partially bit off a police officer’s ear while trying to evade arrest in 1994.

The Australian said Gittany plotted to escape weekend detention in 2003 by jabbing himself with a syringe of hepatitis-infected blood.

In a judgement that took almost five hours to read on Wednesday, Justice Lucy McCallum found Gittany lied with “telling ease” in the witness stand, distorted the truth to denigrate the woman he murdered and fabricated a story that just about fit in with the evidence.

“There can be no doubt the accused was controlling, dominating and at times abusive of Ms Harnum,” Justice McCallum said.

“The force of his jealous and controlling personality met mixed reaction from Ms Harnum, who was at times defiant and at times submissive to an inexplicable degree.

“By the end of July 2011, these tensions had reached a point of crisis.”

Justice McCallum found that by 6am on the morning of her death, Ms Harnum was “in a state of absolute fear and despair”.

As she ran out of the apartment, screaming for help, Gittany dragged her back in a fit of “uncontrollable rage”, the judge said.

Justice McCallum said Gittany’s account of what happened next was “inherently implausible”.

Gittany will be sentenced on February 5.