Andy Coulson has been sentenced to 18 months in prison after being found guilty of conspiring to hack phones.
The former News of the World editor and Downing Street director of communications was last week convicted of one count of conspiracy to intercept communications after an eight-month trial.
His predecessor Rebekah Brooks, along with four other defendants, was cleared of all charges in the trial.
David Cameron hired the journalist as his director of communications, a post he stepped down from in January 2013 due to strain from the trial. The Prime Minister has since apologised for employing him.
The phone hacking trial was sparked in 2011 with allegations that a private investigator had been used by the publication to "hack" voicemails from the mobile phone of schoolgirl Milly Dowler in 2002.
This lead to the closure of News of the World and a trial reportedly costing up to £100million.
A long list of royals and celebrities were victims of the hacking scandal.
Sienna Miller, who gave evidence in the trial, told ITV: "It happened, it's really unfortunate and it does make me incredibly angry but I do feel like justice is being done."