The partner of a Victoria Police officer killed in the Eastern Freeway crash has expressed his devastation over losing his "soul mate", Constable Glen Humphris.

In a powerful showcase of bravery, Todd Robinson stood up to commemorate his partner's life at a media conference today.

Mr Robinson did not shy away from his heartbreak and said he wanted Australia to know the person behind the badge, and the life he leaves behind.

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Todd Robinson, the partner of Constable Glen Humphris speaks to media. (AAP)

"He wore a uniform, but under that uniform he was a person who came home to someone. On that day, he didn't," he said.

"I'm still coming to terms with that door is not going to open. My soul mate has gone."

The couple met in Newcastle, before moving to Victoria. They had been together for four years.

Mr Robinson described how he said goodbye to Constable Humphris on Wednesday morning when he left for work.

He said "take care" as he left for the day, not knowing it would be last time they would see each other.

Constable Glen Humphris. (Victoria Police)

The dedicated police officer was due to arrive home at 7pm that day, but he never returned.

Mr Robinson started preparing dinner and texted him a few times, receiving no response.

When the news broke of the accident on the TV, he began to worry but believed his partner was OK.

"Family members said: 'Is everything alright?'. I said: 'I'm not sure'. I said if he's there involved, he would be just be there helping to control the scene of the accident and he can't respond to me because he's busy," Mr Robinson said.

Kevin King, Joshua Prestney, Lynette Taylor and Glen Humphris were all killed in the line of duty. (Victoria Police)

Two hours had passed and Mr Robinson still had no heard from Constable Humphris. Then he got a knock at his front door, with five police officers delivering the dreaded news on his doorstep.

"I was shocked, I wasn't expecting it, but I knew something wasn't right," he said.

"There is a lot of hurt going on.

"I was expecting him to come home."

It was then he realised his worst nightmare had become a reality.

Todd Robinson leaves a touching tribute for his fallen partner Constable Humphris. (Nine)

But putting on a brave face, Mr Robinson left an incredibly moving tribute for his partner - who was not only a loving partner, but a son, a family member, a friend, a colleague and a protector of the community as a Victoria Police officer.

Mr Robinson said he wanted Constable Humphris to be remembered for his "infectious smile".

"I want people to remember him for the bubbly, outgoing and loving personality and nature he had. He lit up the room when he walked into it. He respected everyone's opinon. More so, he was so proud of being a Victoria policeman."

Constable Humphris was doing his Probationary Constable Extended Training Scheme (PCET) at Collingwood and undertaking a placement in the Road Policing Drug and Alcohol Section.

He was born and raised in Gosford on the NSW Central Coast.

Melbourne's Flinders Street Station lights up in blue colour as a tribute. (AAP)

After working as an apprentice carpenter, he completed a Bachelor of Exercise and Sports Science at University of Newcastle and obtained a Masters in Exercise Physiology at the University of Sydney. He became a sports scientist and exercise physiologist.

Mr Robinson said their first date together was a 30km bike ride in Newcastle. They loved adventure and Constable Humphris was full of life.

The pair enjoyed all the usual activities that many couples do.Mr Robinson said they had adventures overseas, went out on dates and grabbed dinner. They appreciated all the small, but special day-to-day moments they can have no longer.

The fallen Victoria Police officers have been remembered. (Supplied Nine)

Most importantly, they would share each and every day together.

"He would come home after a shift and debrief, and we would talk about our days," Mr Robinson said.

"He would message me on his lunch break and let me know he was ok.