Marcia Collins, the sister of Sean Riggs told Daybreak that she is happy that the IPCC has apologised to her family.
Last year an inquest into Sean Rigg's death found that officers had used "unsuitable force" when he died in Brixton police station in 2008.
Marcia said: "It's been a long struggle, we shouldn't have had wait five years to get to this stage."
More top news
The US has confirmed that it is investigating claims that dozens of civilians were killed by a coalition airstrike targeting IS in Mosul
The breeder thought little Bea would not sell because of her disability.
The four people killed in Wednesday's terrorist attack in London have been honoured by silences across the country.