Stormzy attended a Black Lives Matter demonstration on Saturday (September 10) in support of Chris Kaba's family, after he was fatally shot by police in South London earlier this week.
The rapper, 29, offered his condolences to the family and encouraged those in attendance to "all do our part" to get justice for Chris.
The 24-year-old father-to-be was fatally shot following a car chase in south London on Monday night, with the police watchdog now investigating the tragic incident.
Around 400 people, including Stormzy and Lambeth MP Bell Ribeiro-Addy, gathered in Parliament Square to march on Scotland Yard demanding justice.
Addressing the crowd, Stormzy said: "Chris has a mother, he has a family, he has brothers, he has friends, people who knew him in real life who for them, this is unbearable."
The songwriter added he wanted to speak at the protest because it is important to use his voice to help others.
He said: "I'd just encourage everyone, in whatever capacity, do whatever you can do to help.
"Whatever you can do, whether it's coming to this march, whether it's these amazing people here, whether it's supporting his family directly do whatever you can, but also just have the stamina to keep going."
Stormzy finished by saying: "I'd just encourage everyone who's here today to have the stamina to keep going on this journey because the family needs you.
"There's people in real life, as much as we feel the pain, we don't feel nothing like what these people are feeling. So let's just help them, let's be there for them.
"It could have been your brother, it could have been your uncle, it could have been your nephew, it could have been someone close to you. So I just encourage everyone, we're here together, we love each other, let's all do our part."
A statement released by the IOPC on Friday declared that a homicide investigation has now been launched.
They said: "Mr Kaba died after a single shot was fired by an MPS officer from the specialist firearms command while police attempted to stop and contain the vehicle he was driving.
"This followed the activation of an automatic number plate recognition camera which indicated the vehicle was linked to a firearms incident in previous days.
"The vehicle Mr Kaba was driving was not registered to him."
Speaking at today's protest, Chris' cousin Jefferson Bosela recalled the horrific moment he heard the news of Chris' death.
He said: "I fell to the floor. It felt like a nightmare… The one word I keep repeating to myself - that word is why.”
Holding back tears, he continued: "We deserve the opportunity to look the killer in the eyes and ask why."
Jefferson said Chris was "defenceless unarmed scared and terrified," adding: "We need to make sure they are held accountable and to ensure that there is justice … Not years from now but weeks from now."
