The Serious Organised Crime and Police Act means someone accused of committing a crime can enter into a written agreement to become what's called an assisting offender and help the prosecution by giving evidence against other alleged criminals.
"I know this decision will be disappointing to Mr O'Hagan's widow, family, friends and colleagues but the evidence that can be given by an assisting offender must be carefully evaluated and the test for prosecution applied on a case by case basis, " Mr McGrory said.
The two other men, aged 27 and 25, were arrested on suspicion of assisting an offender.
Robert Moore, 55, of Belvoir Way, Peterborough, has been charged with assisting an offender.
Two other men, aged 21 and 15, were later arrested on suspicion of assisting an offender.
Another four people arrested on Saturday on suspicion of assisting an offender have been released on bail.
The man, who was arrested in Peterborough on Tuesday, is being held on suspicion of assisting an offender.
On Saturday police arrested four males on suspicion of murder and four people on suspicion of assisting an offender.
Robert Moore, 55, has been charged with assisting an offender and will appear at Cambridge Crown Court on 1 July.
Robert Moore, 55, of Belvoir Way, Peterborough, is due to appear before the town's magistrates charged with assisting an offender.
Four males were arrested on suspicion of murder and three females and a male on suspicion of assisting an offender.
He had denied possession of a replica firearm with intent to cause fear of violence, and assisting an offender to escape.
Gwent Police investigating the suspected murder of a missing man have arrested a 15-year-old boy on suspicion of assisting an offender.
Christopher Dean, 40, also of Stoneycroft, admitted assisting an offender and perverting the course of justice and was jailed for 30 months.
Police are taking no further action against a 37-year-old Bristol man who had also been arrested on suspicion of assisting an offender.
Michael Crossley , 26, of Bradford Road, Farnworth, Greater Manchester, and Marcus Hill, 28, of Chedworth Crescent, Little Hulton, Salford, have been charged with assisting an offender.
Mr Wilkinson is also charged with possession of a firearm with intent to endanger life and Mohammed Ali, 32, from Chadderton, is accused of assisting an offender.
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Four other people were held on suspicion of assisting an offender - a man aged 48, a woman of 47 and two girls aged 16 and 17.
Two men, aged 25 and 23, were arrested on suspicion of murder while a man, 30, and a woman, 24, are being held on suspicion of assisting an offender.
Mr Wilkinson is additionally charged with possession of a firearm with intent to endanger life and Mohammed Ali, 32, from Chadderton, Greater Manchester, is accused of assisting an offender.
The men aged 16, 25, 28, 34, 35 and 64 and women, aged 32 and 55, were held on suspicion of assisting an offender and have been released on bail.
At an earlier hearing, Anna Spina, 41, from Newport Pagnell Road, Northampton pleaded guilty to assisting an offender in connection with the robbery at the Co-op store in Laxfield, Suffolk.
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Mohammed Ali, 32, from Chadderton, denies assisting an offender.
Two other men, aged 21 and 15, were later arrested on suspicion of assisting an offender and a 62-year-old Newbridge man was also arrested on suspicion of perverting the course of justice.
Two other men, aged 21 and 15, were also arrested on suspicion of assisting an offender, while a 62-year-old Newbridge man and a 22-year-old Newbridge woman were arrested on suspicion of perverting the course of justice.
The four arrested on suspicion of assisting an offender - a man aged 48, a woman of 47 and two girls aged 17 and 16, were all released on bail late on Sunday night until a date in March.
The defendant Mr Clarence is also charged with aggravated vehicle taking causing the death of Constable Reynolds, the burglary of a house in Fountain Hill and assisting an offender with intent to impede his apprehension or prosecution by changing clothing in an apparent attempt to disguise identity.
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