In 2013, Deborah Bryant's husband Ashley made a harrowing call to triple-0.

Key points: Police who've suffered trauma on the job and took their lives will now be remembered on the wall

Police who've suffered trauma on the job and took their lives will now be remembered on the wall The shift in NSW Police policy is the result of campaigning from loved ones

The shift in NSW Police policy is the result of campaigning from loved ones Retiring police chief Andrew Scipione used his last months in office to change the criteria for inclusion on the wall

The distraught former police officer told the operator: "I'm about to take my life. I suffer post-traumatic stress disorder, I can no longer live with the trauma of it.

"I want this to go to the coroner. There needs to be more things put in place for the partners of those that suffer, 'cause I suffer and so do the partners and there has to be more done with them.

"I have no more to say."

Those were his final words — the end of a long battle with post-traumatic stress disorder (PTSD) following more than two decades as police officer in the Lismore area, in northern New South Wales.

This week, his widow gathered with others to see her husband officially recognised and honoured for his service and sacrifice.

Ms Bryant is among four women who have successfully campaigned to have the names of police officers who took their lives following trauma on the job included on the NSW Police Wall of Remembrance.

The women are the widows and mother of police who died between 1996 and 2013.

The wall, at Sydney's Domain, is still in the process of being etched but was opened on Wednesday to give the women an exclusive first look.

"It's a really, really special day for me personally," Ms Bryant said while viewing the memorial.

"I think that it sends a really important message to the wider police community that these police officers lives really, really mattered and their service is honoured, that's what we wanted."

'I never thought I'd see it in my life time'

Janet Hill's son took his life in 2009 after developing severe depression and PTSD. ( ABC News: Lorna Knowles )

Janet Hill said their campaign began on Police Remembrance Day.

Her son, Constable Morgan Hill, died in 2009 aged 26 after developing severe depression and post-traumatic stress disorder after witnessing a series of traumatic events on the job.

"We expected naively for Morgan's name to be on the wall," Ms Hill said.

"We were very distressed six months after he died to come here for Police Remembrance Day only to be told exclusion criteria prevented them from putting his name from being on the wall and we wrote letters and we persisted."

Ms Bryant and Ms Hill have been supported by Sharan Nicholson-Rogers who lost her husband, Detective Scott Nicholson.

"It's been over 20 years for me since Scott suicided and I never thought I'd see it in my lifetime," she said.

"The fact it's now on the wall it's a recognition my children my grandchildren now can come somewhere and honour Scott and he deserved that.

"He gave everything to the job and now the job is actually recognising him and what he gave."

NSW is the first state to include officers who've taken their lives in their memorial. ( ABC News: Benjamin Sveen )

Kimberley Galvin is the widow of Sergeant Tom Galvin, who died in 2013 after developing post-traumatic stress disorder.

She said it sent a strong message to police everywhere.

"A psychological injury can be considered just as significant as a physical injury and that they won't have to suffer the pain that we have to have," she said.

"[It's] is not about a way person died and recognition and remembrance is about a way a person lived."

Ms Bryant said their campaign was not about personal satisfaction and her late husband would have been embarrassed by the attention.

"[It's for] other police officers who are still serving and those who were injured like our husbands and sons, that we recognise that policing can have a long-reaching detrimental impact on these guys," she said.

Policy shift a first for Australian police

Sorry, this video has expired Retiring NSW Police Commissioner Andrew Scipione has been pushing for the change for some time.

Retiring NSW Police Commissioner Andrew Scipione has used his last months in office to change the criteria for inclusion on the wall to include officers with PTSD who take their lives.

After much campaigning, he backed the women, pledging that the names of their loved ones would be etched on the memorial before he retired.

"I think it was the right thing to do," he told the ABC.

"Those people matter, they are still part of the blue family, the uniform is connected to them and when it's the right thing to do, you just do it."

New South Wales is the first state to include the officers in their memorial and now other states are being urged to follow suit.

"It's something I had raised at a federal level, my colleagues around the nation, together as commissioners we considered this previously," Mr Scipione said.

"Earlier we decided it wasn't something we would embark on. I've since had the opportunity to raise that again with my commissioner colleagues in terms of a national response but in the meantime I still had the opportunity to do it here as a state decision and I made that decision only recently."

The women say they will continue to campaign to see the same honour bestowed at the National Police Memorial in Canberra.