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Five Metropolitan Police officers have been cleared of misconduct over the death of a musician who died in Brixton Police station.
Sean Rigg, 40, who had schizophrenia, died after he was restrained while in custody in August 2008.
PCs Andrew Birks, Richard Glasson, Matthew Forward and Mark Harratt and Sgt Paul White were accused of a string of failings over Mr Rigg's treatment.
A Met Police misconduct panel found "none of the allegations are proved".
The Met said it was sorry about Mr Rigg's death, and that it had "fully scrutinised" all the facts.
The five officers had faced disciplinary proceedings over the arrest and detention of Mr Rigg more than a decade after he died.
'Sleepless nights'
The Police Federation, which represents police officers, has now called for a one-year time limit for disciplinary proceedings.
Mr Rigg's sister, Marcia Rigg-Samuel, said: "It's been traumatic, sleepless nights. Reliving the death at various stages in these 10-and-a-half years that no family should have to go through."
Mrs Rigg-Samuel has campaigned for nearly 11 years to have her brother's death investigated.
She said: "We should be able to rely on the judicial system to do the right thing in a reasonable period of time.
"Ten-and-a half years is totally unacceptable in itself."
Mr Rigg was arrested in Balham in August 2008 after he was seen aiming karate kicks at members of the public for no apparent reason.
He was restrained in the prone position by three officers for more than seven minutes and later died after suffering a heart attack.
An Independent Police Complaints Commission (IPCC) investigation was launched, but found police had acted "reasonably and proportionately".
However in 2012, an inquest jury found police had used "unsuitable force" when they arrested Mr Rigg.
No criminal charges were brought over his death, apart from one count of perjury against Mr White, who was later cleared.
Sean Rigg death timeline
- August 2008 - Sean Rigg arrested in Balham. He dies of a cardiac arrest hours after being restrained
- Independent Police Complaints Commission (IPCC) launches an investigation into Mr Rigg's death, which concludes that there was no evidence of neglect or wrongdoing and that the police had acted "reasonably and proportionately"
- August 2012 - Southwark Coroner's Court concludes police used "unsuitable and unnecessary force" on Mr Rigg
- November 2012 - Independent review into IPCC's handling of the case launched
- March 2013 - Three Met Officers are arrested on suspicion of perverting the course of justice
- May 2013 - Independent review concludes the IPCC's review of Mr Rigg's death contained a series of failings, and recommended investigators re-examine key evidence including whether officers should face misconduct proceedings
- October 2014 - Crown Prosecution Service (CPS) announces there will be no criminal charges raised against the officers
- July 2015 - CPS reopens investigation into Custody Sergeant Paul White under the Victims' Right to Review
- November 2016 - Southwark Crown Court unanimously acquits Sgt White of perjury
- April 2018 - Independent Office for Police Conduct (IOPC) instructs the Met Police to begin gross misconduct hearings against five officers
- March 2019 - All five officers are cleared of misconduct
Phill Matthews, of the Police Federation, said: "The federation are campaigning for investigations to be completed in a timely manner to prevent further officers being subject to prolonged stress and trauma.
"We're calling for a time limit, not because we are trying to get officers off on technicalities, but because we argue that 12 months is a more than adequate length of time for any non-criminal investigation to be satisfactorily concluded."
Helen Ball, Assistant Commissioner of the Met Police said: "I would like to extend my deepest sympathies to Mr Rigg's family. They have lost a much-loved son and brother and we are truly sorry.
"The officers were sent that day into the most challenging of situations.
"The panel has today found that they did not breach any of the standards of professional behaviour. I do hope Mr Rigg's family can be reassured that all these processes have allowed for full and thorough scrutiny of all the facts."