I didn't think this story could get any worse, but it just did:

Two police officers who corroborated a seemingly false account of the fatal shooting of Samuel DuBose in Cincinnati were previously implicated in the death of an unarmed, hospitalised and mentally ill black man who died after he was “rushed” by a group of seven University of Cincinnati police officers.

Kelly Brinson, a 45-year-old mental health patient at Cincinnati’s University hospital, suffered a psychotic episode on 20 January 2010 and was placed inside a seclusion room at the hospital by UC officers. He was then shocked with a Taser three times by an officer and placed in restraints. The father of one – son Kelly Jr – then suffered a respiratory cardiac arrest and died three days later.

In court documents obtained by the Guardian and filed by Brinson’s family in a civil suit against the UC police and the hospital, all seven officers are accused of using excessive force and “acted with deliberate indifference to the serious medical and security needs of Mr Brinson”.

According to the lawsuit, before Brinson was placed in restraints he “repeatedly yelled that slavery was over and he repeatedly pleaded not to be shackled and not to be treated like a slave”.

The documents named University of Cincinnati officers Eric Weibel and Phillip Kidd – the same men who, in a formal report, supported officer Ray Tensing’s claim that he was “dragged” by DuBose’s vehicle on 19 July.

Tensing’s account that he was “dragged” was used as justification for the lethal use of force. It was later dismissed as an attempt to mislead investigators and as “making an excuse for the purposeful killing of another person” by the Hamilton County prosecutor Joseph Deters, who charged Tensing with murder on Wednesday.

The revelation that officers Weibel and Kidd provided the corroboration for Tensing’s account of the incident was met with anger by Brinson’s family members, who told the Guardian on Thursday that if both officers had been disciplined correctly in 2010, the death of DuBose might have been avoided.

“If something had been done in 2010, I don’t think this wouldn’t have happened,” Kelly Brinson’s brother, Derek, said in an interview.

The officers involved in his brother’s death were “supposed to be fired”, Brinson said. “But what happened was because we had an out of court settlement, they had immunity and they couldn’t be prosecuted.”

“Everybody … associated with this case was supposed to be terminated,” he said. “And they didn’t – they didn’t terminate them.”

Also, this update:

Former @uofcincy cop Ray Tensing,murderer of #SamDubose, files grievance to get his job back http://t.co/tfVW0mT2Nc pic.twitter.com/dlg6ZG1Uzq

— Anonymous (@YourAnonNews) July 31, 2015