Andriy Yermak was a constant, looming presence in Ukraine's government - a seemingly immovable figure on the political stage.
Despite his towering frame, you might not always have spotted him. Yet, wherever President Volodymyr Zelensky was, Yermak was often not far away.
As his chief of staff, Yermak wielded enormous power at the top of government and was even trusted to negotiate on Ukraine's behalf at peace talks with the US.
But as his influence grew, so did public resentment of the power wielded by this unelected official. His political career came to an abrupt end on Friday, hours after anti-corruption investigators raided his home in Kyiv.
Yermak and Zelensky first met in 2011 when the former was an intellectual property lawyer and the latter a TV producer.
After working together during the successful presidential campaign of 2019, Yermak became Zelensky's chief of staff. He stood next to the president as he gave his now famous "we are still here" speech as the Russians descended on Kyiv at the start of their full-scale invasion in February 2022.
As Zelensky concentrated his power over time, Yermak was widely viewed as the second most powerful person in Ukraine. He reportedly helped shape foreign policy, ousted political rivals and even made battlefield decisions.
Ukrainian politics is shaped by big characters, and Zelensky's administration had not one, but two of them.
Despite the favourable conditions Yermak enjoyed within the sprawling Presidential Office, the same couldn't be said outside its steep walls.
His popularity was nosediving.
A widening scandal
President Zelensky had successfully grappled with corruption scandals in the past, but in July a chain of events began that has shaken the current government to its core, weakening Zelensky politically and costing him his right-hand man.
That month, the president convinced parliament to formally remove the independence of Ukraine's two anti-corruption bodies and bring them under direct government control.
At the time, Zelensky said it was to limit Russian interference.
But the public - as well as the European Union - disagreed, and he was forced to U-turn after mass demonstrations.
By the autumn, those same agencies, the National Anti-Corruption Bureau (Nabu) and the Special Anti-Corruption Prosecutor's Office (Sapo), released the findings of a lengthy investigation that implicated members of Zelensky's inner circles.
Senior figures - including two ministers, a former deputy prime minister and a one-time business partner of Zelensky's - were accused of syphoning $100m (£75m) from public projects in the energy sector.
At a time when Russia is pummelling Ukraine's energy grid with missiles and drones ahead of a fourth winter of war - forcing the entire country to endure daily power cuts - public anger at these corruption allegations has soared.
Just on Friday night alone, Kyiv endured a nearly 11-hour-long Russian air raid, which left more than half a million people without power.
"We're going through one of the most difficult times in our history," Iryna, a Kyiv resident, told the BBC this week. "Unfortunately, lots of families will not see their loved ones, their men, brothers or husbands, because of the war."
Despite not being named as a suspect and denying any involvement in the scheme, Andriy Yermak couldn't distance himself.
There was a suspicion he may have known something.
Local media reported on Saturday that investigators were combing through several laptops and mobile phones they had seized from his flat during their search.
Yermak led last week's talks with US Secretary of State Marco Rubio in Geneva, apparently securing some concessions for his country in a US-drafted peace proposal which many feared heavily favoured Russia.
At a time when Ukraine is fighting and negotiating for its very survival, his resignation is hugely destabilising.
Talks will continue next week. Ukraine's presidential office said on Saturday that Defence Minister Rustem Umerov was the head of a delegation heading to the US.
What is not known is whether this will be a timely reboot for Kyiv, or a costly lack of continuity.
It is also not known how Yermak is taking his sudden departure from government. The New York Post reported on Saturday that he had texted their paper and vowed to go to the front line. He also declared his innocence.
"I'm going to the front and am prepared for any reprisals," he reportedly said. "I am an honest and decent person."
But there is a feeling that Yermak's departure is a sign of positive change.
"Let's call it what it is: Good news," says Olga Rudenko, editor of the Kyiv Independent.
"Think about it: A young democracy like Ukraine has independent institutions that are strong enough to investigate the most powerful man in the country - and to do so during the war.
"People rooting for Ukraine around the world aren't rooting for a place on the map, but for a place living by certain values - and fighting for them. Today we see these values in action.
"This shows why Ukraine is exactly the country worth supporting."
