Sydney vigil for Curtis Cheng

Candles have been lit outside Parramatta police headquarters during a community vigil for slain police accountant Curtis Cheng.

About 30 members of Parramatta's multicultural community groups, including leaders, politicians and police, paid tribute to the father of two who was murdered as he left work on October 2 by 15-year-old Farhad Khalil Mohammad Jabar.

"The Chinese community has lost a son. May he rest in peace," NSW Multicultural Communities Council chairman Tony Pun said.

Community leaders took turns to speak in memory of Mr Cheng, a 17-year veteran of the NSW police service.

Parramatta City Council Lord Mayor Paul Garrad said Mr Cheng's death shouldn't be for nothing.

"We will stand together to ensure that the harmony we are so proud of, the harmony that we have experienced in the past, unites us into the future," he said.

"It's a sad moment for his family and we feel deeply for them, but it won't be for nothing. Curtis' life won't be for nothing."

The special constable who fatally shot Jabar was also in the minds of those who attended.

"Nobody expects to be shooting a 15-year-old boy," Parramatta MP Julie Owens said.

"Can we all just keep that special constable in our hearts."

She also expressed her condolences to Jabar's family.

"There is a family out there that lost a 15-year-old boy that day, though actions of his own, but nevertheless they lost a son," she said.