When Russian soldiers shot Leonid Pliats and his boss in the back, CCTV cameras captured the murder in clear and horrific detail.
The images, which were obtained by the BBC, are now being investigated by Ukrainian prosecutors as an alleged war crime.
The incident occurred during the height of the fighting around kyiv, when the main roads to the capital were a battlefield. That included the area around the bike shop where Pliats worked as a security guard.
But this was not an exchange of bullets: the video clearly shows heavily armed Russian soldiers shooting the two unarmed Ukrainians and then looting the business.
We have reconstructed the entire sequence, comparing what was recorded on multiple CCTV cameras at the scene with testimony from people Pliats called that day, as well as volunteer Ukrainian fighters who tried to rescue him.
The Russians arrive in a stolen van with the V sign used by Russian forces and a sign that says “Russian SWAT Tank” in black paint. They are dressed in Russian military uniform and approach with their weapons raised, fingers on the triggers.
Pliats walks towards the soldiers with his hands up to show that he is unarmed and not a threat.
The Russians initially talk to him and his boss through the fence. There is no audio on the footage, but the men seem calm, even smoking. Then the Ukrainians turn around and the soldiers start to leave.
Suddenly, they turn around, crouch down and then shoot the two men several times in the back.
One dies on the spot, but somehow Pliats manages to get back on his feet, though it wobbles. He ties his belt around his thigh to reduce blood loss.
Then he makes his way to his cabin, where he begins to ask for help.
Vasyl Podlevskyi spoke on phone with his friend twice that day, while he was bleeding profusely.
Pliats told him that the soldiers claimed that they do not kill civilians and then they shot him.
“I said, can you at least bandage yourself? And he said to me, Vasya, I barely crawled here. It hurts me a lot. I feel really bad”, recalls Podlevskyi.
“So I asked him to wait and started calling the territorial defense”, he adds.
“When we arrived, he was already dead”
The men she went to, Sasha and Kostya, used to sell air conditioning before the war, but now they are combatants.
They both show me videos on their cell phones of Russian tanks passing their positions. Their job was to send real-time information on Russian movements to Ukrainian military positions along the way.
When Pliats was wounded, they were tasked with crossing the dangerous highway E40 to try to save it. Even today, the road is littered with charred Russian tanks, a reminder of the intensity of the fighting.