The partner of Constable Glen Humphris has delivered an emotional tribute to his "soul mate", recounting the moment he learnt the newly-graduated officer had been .
Four Victorian police officers - - were hit by a refrigerator truck and killed on Wednesday evening as they impounded a speeding Porsche.
The crash was the single greatest loss of life in Victoria Police history.
Constable Humphris' partner of four years, Todd Robinson, addressed media on Friday afternoon after families of the three other officers requested privacy.

From left to right: Leading Senior Constable Lynette Taylor, Constable Josh Prestney, Senior Constable Kevin King, and Constable Glen Humphris. Source: Victoria Police
He described Constable Humphris as a "bubbly, outgoing, and loving" person who was passionate about the outdoors.
"He wore a uniform, but he was a person under that uniform. He came home to someone, and on that day he didn't," Mr Robinson said. "My soulmate has gone."
Constable Humpris graduated from the police academy last month and was undertaking his probationary placement after previous careers as a carpenter and personal trainer on the NSW Central Coast.
Mr Robinson, who is a member of the Australian Defence Force, described hearing about the crash on the news before growing concerned when he hadn't heard from Constable Humphris.
"I knew something wasn't right," he said. "At that moment, I got a knock on the door with five senior police officers."
Victoria Police Chief Commissioner Graham Ashton said on Friday he was "deeply touched" by the messages of support sent in from across the country.
A Victoria Police Facebook page dedicated to the deceased officers had received more than 142,000 messages, he said, while a separate memorial site had received another 11,000.
The police legacy foundation had also received "many thousands of dollars", he said.
Due to social distancing restrictions imposed due to the coronavirus pandemic, four small services will be held for the officers at different locations, which will be live-streamed to the public.
Commissioner Ashton said planning was already underway for a large public service, with full police honours, once it is safe to do so.
The driver of the speeding Porsche, 41-year-old Richard Pusey, after allegedly fleeing the scene on foot following the crash.
Police will allege he was driving under the influence of drugs and failed to administer first aid to the officers.
He has been charged with dangerous driving, reckless conduct endangering life, failing to render assistance, drug possession and the destruction of evidence.
The driver of the truck, Mohinder Singh Bajwa, remains under police guard at hospital after suffering a medical episode at the scene.
Commissioner Ashton said Mr Bajwa was being medically assessed on Friday afternoon, with police hopeful they would soon be able to conduct an interview.