He was arrested on suspicion of corruption and suspicion of misconduct in public office.
Richard Trunkfield, 31, was charged with misconduct in public office at HMP Woodhill, in Milton Keynes.
BBC: Operation Elveden: Prison worker faces misconduct charge
And a fourth person, a public official, also admitted conspiring to commit misconduct in public office.
Ex-prison worker Richard Trunkfield, 31, and an ex-policeman also pleaded guilty to misconduct in public office.
He was arrested at 06:00 GMT at his home in Wiltshire on suspicion of misconduct in public office.
Four constables and a custody sergeant were charged with manslaughter and misconduct in public office but were acquitted following a trial.
On 15 December, a 52-year-old police constable from the same police group was arrested on "suspicion of misconduct in public office".
The AP said both men pleaded guilty to misconduct in public office.
In November, both were charged with conspiracy to commit misconduct in public office, in relation to separate alleged payments to public officials in exchange for information.
The CPS has also charged a former Metropolitan police officer, Paul Flattley, and Virginia Wheeler, a journalist from The Sun, with conspiracy to commit misconduct in public office.
He faces a charge of committing misconduct in public office.
Ms Casburn denies one charge of misconduct in public office.
On Thursday, the Met confirmed Operation Elveden officers had arrested a 51-year-old police officer at approximately 06:00 GMT at his home in Wiltshire - on suspicion of misconduct in public office.
The man, a former member of the armed forces, was arrested on suspicion of misconduct in a public office and the woman on suspicion of aiding and abetting misconduct in a public office, police said.
The investigation will cover possible offences of manslaughter, perverting the course of justice by changing police statements, perjury by officers who gave evidence on oath, perverting the course of justice by misleading journalists and misconduct in public office.
Eight others have also been sentenced, receiving jail terms of between six months to three years and four months, for offences including conspiracy to supply controlled drugs, stealing cannabis and conspiracy to commit misconduct in public office, the Met said.
Alison Levitt QC, principal legal advisor to the director of public prosecutions, said in a statement that Mr Webster was charged with "two offences of conspiring to commit misconduct in public office, contrary to section 1(1) of the Criminal Law Act 1977".
BBC: The Sun's Geoff Webster charged over payments to officials
The pair pleaded guilty to misconduct in a public office at Newcastle Crown Court in January.
The PC, along with fellow officer Damian Cobain, was convicted of misconduct in a public office.
Married Giff, of Sandy, Bedfordshire, admitted three counts of misconduct in a public office.
Trunkfield pleaded guilty to misconduct in a public office between 2 March and 30 April 2010.
At the second trial, Dizaei was also convicted of misconduct in a public office.
Rebecca Swanston is accused of three counts of misconduct in a public office between January and October 2012.
He is being questioned on suspicion of misconduct in a public office and his property has been searched.
Alan Tierney, 40, pleaded guilty at the Old Bailey to two offences of misconduct in a public office.
He was questioned on suspicion of misconduct in a public office before being released on bail until April.
The 59-year-old was held on suspicion of offences including misconduct in a public office contrary to common law.
The officer was arrested at her workplace in central London on suspicion of misconduct in a public office.
Michael Fletcher, 31, of Blackwood Court, Bacup, Lancashire, admitted misconduct in a public office at an earlier hearing.
The officers all also deny a charge of misconduct in a public office.
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