24-year-old Garda Gary Mc Loughlin died following a traffic collision at Lisfannon, Burt in December 2009.
27-year-old Martin McDermott was jailed for seven years as a result after the car he was driving rammed into Garda McLoughlins patrol car.
While serving his sentence McDermott escaped from Loughan House Open Prison after serving just three quarters of his sentence.
During his rearrest in Derry he assaulted several police officers and served four months in the North before being extradited back to the Republic.
But in spite of these actions while in custody, McDermott will still be released from prison after serving three quarters of his sentence.
He qualifies for 25% remission for his sentence for manslaughter and his due to be released next June.