Nowak was stabbed five times by Vickrum Digwa, 23, on his way home from a night out on 3 December 2025.
When police arrived, Digwa falsely claimed he had been the victim of a racist attack.
Officers handcuffed Nowak as he lay dying, despite him repeatedly saying he had been stabbed.
He died shortly afterwards.
Bodycam footage of the arrest, released publicly, showed an officer responding to Nowak's pleas with "I don't think so, mate".
The footage prompted widespread outrage and protests in Southampton, leaving 11 police officers injured.
Hampshire Constabulary's chief constable has since apologised to the family, telling the BBC that the handcuffing was "a tragedy, absolutely a tragedy".
Four officers involved in the incident have been taken off patrol duties, though they have not been formally suspended.
The Independent Office for Police Conduct is investigating whether the officers' actions were racially motivated.
Sir Keir met Nowak's father, mother and stepmother at Downing Street on Thursday.
PM Starmer said he was "profoundly humbled" by the encounter and that he was "determined to prevent other families from suffering such a devastating loss".
An inquest into Nowak's death – which will examine whether police actions contributed to it – is scheduled for September next year, though a coroner indicated on Thursday he hoped to bring the date forward.
Conservative leader Kemi Badenoch also met the family, saying they had called for cross-party cooperation to "rebuild trust in the police".
She additionally called for a review of religious exemptions allowing the carrying of bladed weapons in public.
Digwa had been carrying a kirpan – a knife required to be worn by practising Sikhs – along with a second, larger dagger.
Digwa was sentenced to life in prison on 2 June, with a minimum term of 21 years.
His mother was also convicted of helping to conceal the murder weapon.
Elon Musk posted several times on X criticising the police response and accusing mainstream media of underreporting the case.
In response, Starmer accused the billionaire of trying to "whip up division" in the UK, noting that Nowak's family had appealed for calm.
The US State Department also weighed in, posting on X that "ideological conditioning and two-tiered policing are glaring symptoms of civilizational decline".
The British prime minister rejected claims of a "two-tier" police system made by Reform UK leader Nigel Farage, who also said he plans to meet Nowak's family.
(ał)
Source: BBC, tvp.info, interia.pl