A 33-year-old man has been charged with murdering prison officer David Black in Northern Ireland.
Mr Black was gunned down on a motorway on his way to work at Maghaberry high security prison in Co Antrim in November 2012.
Dissident republicans opposed to the peace process were blamed.
Detectives from the Police Service of Northern Ireland (PSNI) also charged the suspect with possessing a firearm with the intent to endanger life.
Mr Black, a 52-year-old father of two, was shot dead at high speed on the M1 motorway in County Armagh.
He was the 31st member of the prison service to be killed in Northern Ireland, the first such murder in almost 20 years.
The suspect, who was detained yesterday in the Lurgan area of Co Armagh, is to appear in court in Craigavon tomorrow.
Mr Black lived in Cookstown, County Tyrone, and the Toyota Camry car used in his killing was later found burnt out in Lurgan.
Two other men, one in Northern Ireland and one in the Republic of Ireland, face charges linked to the purchase and movement of the Toyota Camry.
A PSNI spokeswoman said the force wanted to thank Irish police for their help and support throughout a "difficult and complex" investigation spanning both sides of the border.