Heartbreaking photo shows hero cop with his twins before he shot himself dead at a police station - as community rally behind his family with a final act of kindness

A New South Wales police officer who died after he shot himself at a police station has been identified as Sergeant Matthew Theoklis.

The father of three-year-old twins was found dead in an office of the Sydney Police Centre on Goulburn Street in Surry Hills at 7.30am on November 30.

Mr Theoklis, who was known as 'Theo', leaves behind his fiancée Rebekah, who is a member of the NSW Police Force, and daughters Brooke and Sophie. 

Sergeant Matthew Theoklis was found dead in an office of the Sydney Police Centre on Goulburn Street in Surry Hills at 7.30am on November 30

The father had worked as a policeman for the past 15 years and was a Sergeant with the Eastern Beaches Police Area Command. 

At the time of his death, the policeman had been carrying out duties with the Major Events and Emergency Management and State Planning Unit.

He had been promoted to a Sergeant in December last year. 

With the tragic news shocking the community, a fundraiser has since been set up to help support Mr Theoklis' two young girls. 

The fundraiser, which was set up by the NSW Police Legacy organisation has already raised close to $3,000.

'Theo was a well-respected member of the NSW Police Force who took immense pride in his job,' a statement read.

'He performed his duties with the highest of professionalism and will be remembered for the fun and antics, for which he was renowned.

'Theo was a wonderful father who cherished his girls and would constantly talk about them.' 

An earlier statement from NSW Police said his death was not being treated as suspicious.

Lifeline 13 11 14.  

With the tragic news shocking the community, a fundraiser has since been set up to help support Mr Theoklis' two young girls

Mr Theoklis (pictured holding his twin daughters)  had been promoted to a Sergeant in December last year