Two former Nottinghamshire police officers have been jailed after pleading guilty to corruption charges.
Details of the case were not released until Thursday
Charles Fletcher, 25, and Phillip Parr, 40, admitted at Birmingham Crown Court to separately passing data on serious inquiries to suspected criminals.
Fletcher, a trainee detective, was jailed for seven years and Parr, a former Pc, was sentenced to 12 months.
The 25-year-old leaked details of investigations including the murder of Nottingham jeweller Marian Bates.
Fletcher also admitted two charges of conspiracy to pervert the course of justice.
Five men who admitted obtaining the information have been jailed for a total of 15 years.
Jason Grocock, 33, was convicted of conspiracy to commit misconduct in a public office and two further charges of conspiracy to pervert the course of justice. He was sentenced to four years.
David Barrett, 40, was convicted of two charges of conspiracy to commit misconduct in a public office and was sentenced to three years.
Darren Peters, 38, and Javade Rashid, 40, were convicted of the same charge and were sentenced to four years and to six months respectively.
The fifth man cannot be named for legal reasons.
Grocock, Rashid, Peters and Barrett was also jailed
The court heard Fletcher trawled police computer data bases to find information that he supplied to criminals over a two-and-a-half-year period between December 2002 and June last year.
He sought information about the Marian Bates murder in 2003 and the double murder of Joan and John Stirland, who were executed at their bungalow in Trusthorpe, Lincolnshire, in August 2004.
The court heard that the details Fletcher was able to glean about the murder cases were of "limited significance", partly because he was under surveillance by other officers.
The information was handed to Grocock, the manager of Limey's clothing store in Nottingham, who passed them on to criminals.
Fletcher also revealed the identities of suspects, witnesses and victims involved in other cases, as well as conducting intelligence checks on suspected criminals at their request.
He then faxed the information, which included details of surveillance, vehicles associated with them and information from anonymous informants, to the suspects, the court heard.
In return for his services, the 25-year-old received discounts on designer suits from a Nottingham fashion store.
The judge said the effect was that people suspected of serious crime infiltrated the police force through Fletcher which could have prevented or delayed the arrest of criminals and helped them to carry out crimes.
Judge John Saunders QC said Fletcher's activities put the lives of vital witnesses and informants at risk, damaged the morale of the Nottinghamshire police force and undermined the trust placed in the police by members of the public.
He said: "Corrupt police officers do untold damage to the criminal justice system."
Parr supplied confidential information on two occasions.
The two men acted separately, but the information from Parr was passed back to the same criminals via Javade Rashid and David Barrett, the court heard.
'Contempt and anger'
Assistant Chief Constable Ian Ackerley said the force had suspected for some time that people within the organisation were feeding information to criminals.
He said officers had set up a covert operation to find the culprits.
Chief Constable Steve Green said he felt "contempt and anger" for the two officers, both of whom have lost their jobs.
He said their "base and selfish behaviour" had damaged the reputation of the "fine, decent, hardworking, honourable people" who served Nottinghamshire Police.
"We have been let down and, more importantly, the people we serve have been let down.
"Our integrity is our greatest asset. It must not be compromised. We never flinched in our duty to investigate our suspicions and in prosecuting those who betrayed our trust."
The court heard Fletcher wrote a to a friend while on remand saying that it took him a long time to "come to terms with the shame of my actions, but most especially the betrayal of all my old colleagues".
"In answering why, I feel my greed, vanity and naivety were to blame... I was blind to the consequences of my actions and chose to ignore them," he said.
"So selfishness played a big part in my downfall as I showed no regard for how my actions would affect my family, friends and those close to me."