A Canberra public servant who stalked a woman by sending animal faeces to her work, breaking into her home and graffitiing sexually abusive messages across her bedroom is being sentenced in Darwin's Supreme Court.

Key points: 54-year-old Paul Anthony Bennett plead guilty to 12 offences in March, including stalking, trespass and breaching a DVO

54-year-old Paul Anthony Bennett plead guilty to 12 offences in March, including stalking, trespass and breaching a DVO Victim impact statement said Bennett's action 'ruined her life'

Victim impact statement said Bennett's action 'ruined her life' Bennett will be sentenced in August

Paul Anthony Bennett, 54, who worked for the Department of Home Affairs throughout his offending, has pled guilty to a string of stalking charges including trespass, stealing, property damage, and breaching a domestic violence order.

Justice Peter Barr said Bennett acted out of "pathological jealousy" in order to "torture her psychologically."

Throughout the offending Bennett broke into the victim's parked car to steal her house keys, broke into her home, stole underwear and a Paspaley ring and used a black marker to write messages like "mummy is a slut" and "whore" across her house.

After police issued a DVO, Bennett used a fake ID to fly to Darwin, stalk the victim, trespass onto her partner's home and douse his car and backyard pool with petrol.

Victim filmed through kitchen window, court hears

Prosecuting barrister Mary Chalmers said Bennett's conduct was severe.

"Certainly the most severe case of stalking I have come across in my career," she said.

Quoting from the victim impact statement, Ms Chalmers said Bennett's actions "ruined her life" and that "she felt terrified".

Ms Chalmers said Bennett was "motivated by jealousy, anger and a severe form of revenge".

The court also heard Bennett trespassed onto her new partner's property and used a mobile phone to film private activity between the victim and partner through a kitchen window without their knowledge.

Bennett sent intimate images of the victim and her new partner to her ex-husband, who, the court heard, out of concern for the safety of his children, sought their full custody — an application that cost the victim over $20,000 in legal fees to fight.

Offending caused by an 'inability to deal with rejection'

Justice Barr said Bennett became "obsessed with this lady" and wanted to "undermine" her new relationship.

"He wanted her to feel his pain and it seems to be the way he approached the whole thing," said Justice Barr.

Defence lawyer Matthew Hubber stressed that counselling needed to be at the forefront of a sentencing decision.

Mr Hubber said it was Bennett's "inability to cope with rejection which sparked this downward spiral".

"He's someone that needs treatment," he said.

Bennett will be sentenced in August.