A woman has pleaded guilty to firing one of 35 shots during a 16-hour siege

A woman has entered a plea over her involvement in a 16-hour siege during which 35 gunshots were fired towards police.

The Special Operations Group was called to the siege in Trevallyn in December 2018. Picture: BRUCE MOUNSTER

A SECOND shooter has pleaded guilty to firing an illegal firearm during a 16-hour siege at Trevallyn in December 2018.

Nomi Lea Mountney, 42, on Monday pleaded guilty in the Supreme Court in Launceston to recklessly discharging a firearm, possession of a firearm without a firearms licence and possession of a rifle that had been shortened to less than 65cm.

Prosecutor John Ransom said Mountney was responsible for one of 35 shots fired from a .22 calibre rifle during the siege at 33 New World Avenue.

He said a member of the public reported a man who appeared to be carrying a firearm in a bag walking on New World Avenue before entering the home at number 33 on December 7, 2018.

Police determined the man was Brett Julian Robinson-Stacey, 25, who last week pleaded guilty to charges associated with the siege and was sentenced in the Supreme Court in Launceston.

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• New World Ave residents relive suburban siege terror as gunman sentenced
• Brett Julian Robinson-Stacey to be sentenced over 17-hour siege at Trevallyn
• Court hears of ‘terrified’ residents and ‘extreme danger’

Tasmania Police outside the New World Avenue house that was the scene of a 16-hour siege. Picture: BRUCE MOUNSTER

“Detectives and uniform police attended and set up a cordon,” Mr Ransom said.

Detectives went to the door of number 33 and called out Robinson-Stacey’s nickname “Tubbsy” and said: “It’s the police.”

Mr Ransom said a police Special Operations Group also attended the scene, residents were prevented from coming or going from the area, and some residents were evacuated.

Police negotiators spoke to both Mountney, who was the tenant at the home, and Robinson-Stacey throughout the siege.

The court heard that in a statement made on December 8, one officer said he took up a position in a yard that allowed him to make “clear observations through a window”.

Brett Julian Robinson-Stacey is led away by police after the siege. Picture: BRUCE MOUNSTER

At 7.37pm he saw Robinson-Stacey appear at the window fiddling with what appeared to be a mobile phone.

Then at 7.45pm Mountney appeared at the window wearing a singlet and carrying a “cut down firearm” in one hand, looking calmly around before firing it from hip level and then disappearing from view.

Justice Robert Pearce on Monday dismissed a charge against Mountney alleging she was involved in wounding Robyn Lee Brown by shooting her in the leg two days earlier.

Robinson-Stacey took responsibility for the wounding with a guilty plea to a charge of causing grievous bodily harm.

Justice Pearce will sentence Mountney in the Supreme Court on Tuesday.

Robinson-Stacey was sentenced to eight years in prison for charges relating to shooting Ms Brown and the siege, including firing 34 of the 35 shots fired.