Police Constable William Crews, accidentally shot by a colleague, was a man of loyalty and integrity who loved his job, his brother Ben Crews has told the fallen officer's funeral service.

``He loved his job and gave it everything that he could offer and I believe that this was why he was so successful in his chosen profession,'' Ben, who is also a police officer, told the service on Thursday.

``He was a larrikin and loved to laugh but also knew when the job had to be done.''

The 26-year-old trainee detective was accidentally shot dead by a colleague a week ago, while on a drug raid in Sydney's southwest with the Middle Eastern Organised Crime Squad.

Mr Scipione also announced he had posthumously given the dead officer a detective's designation.

``Positions in the State Crime Command are most sought after,'' Mr Scipione said.

``It is home to the most complex and serious cases and it is the place where our most skilled detectives want to go.

``If you get there at all it's usually after a long apprenticeship.

``If you get there quickly it's because you've got something that sets you apart, and William had that certain something.''

Constable William Crews reached a milestone on the NSW Police Honour Roll that no one should have met - he is the 250th NSW police officer to pay the ultimate sacrifice in the execution of his duty.

https://www.australianpolice.com.au/william-arthur-george-crews/?print=print