Liam Adams who was convicted of raping his daughter in the late 1970s and early 1980s has died.
The brother of former Sinn Féin leader Gerry Adams had recently been moved to a hospice from Maghaberry Prison earlier this month for end-of-life care for terminal cancer.
He was serving a 16-year sentence for a string of attacks on his daughter Aine Dahlstrom when she was aged between four and nine.
The 63-year-old was convicted in 2013 of ten offences against his daughter - three counts of rape, four of indecent assault and three of gross indecency.
In a statement the Northern Ireland Prison Service "confirmed the death in custody of a 63-year-old prisoner from Maghaberry Prison."
The Prison Service said the man died this morning.
They said that as with standard procedure, the PSNI and Prisoner Ombudsman have been informed.
Ronnie Armour, Head of the Northern Ireland Prison Service said: "I would like to extend my sympathy to the family of the prisoner. My thoughts are with them at this difficult time."
