The sister of Sean Rigg, who died while he was being held at Brixton police station in 2008, has welcomed a review which said the IPCC should look again at whether police officers should face misconduct proceedings for the way they dealt with Rigg.
She said: "It is the family's strong opinion that possible criminal offences should also be considered afresh."
"My family's pursuit of justice and our dignified determination to arrive at a truly clear picture of what happened," she added, "has hopefully contributed to real and positive change into the way the IPCC and all key agencies should fulfil their obligations, by law, into a death in custody."
IPCC chairwoman Dame Anne Owers said that Sean Rigg's family had shown "determination and dignity" over a long period. She added:
We are already taking a critical look at the way we investigate deaths in general and this specific review, and the lessons to be learnt from it, will play an important part in the way that we develop and change our approach.
The police were criticised today for using an "unsuitable level of force" before the death in custody of a schizophrenic. Sean Rigg, a physically fit 40-year-old, was being held in the back of a police van at Brixton police station in south London when he died of cardiac arrest on August 21 2008.
An inquest jury found that officers used "unsuitable" force after arresting Mr Rigg for attacking passers-by and police officers. Coroner Andrew Harris said:
"The level of force used on Sean Rigg whilst he was restrained in the prone position at the Weir estate was unsuitable. In addition, there was an absence of leadership. This led to a failure to take appropriate control of the situation."
An inquest has ruled police used an "unsuitable level of force" and demonstrated an "absence of leadership" leading up to the death of Sean Rigg by cardiac arrest at Brixton police station in August 2008.