The son of high-profile republican Dominic McGlinchey has died suddenly.
Declan McGlinchey was aged 39 and a father-of-seven.
He died late on Sunday night from a suspected heart attack, according to the Irish News, which reports he suffered chest pains and was treated by paramedics, but died at his Bellaghy home.
News of his death was announced today on the Facebook page of Vol. Matt McLarnon Cumann Irish Republican Socialist Party - Falls Road.
"It is with deep shock and sadness that we learn of the sudden passing of our friend and comrade Declan McGlinchey," they said.
"(Declan) was born into a life of hardships and struggle. He was the son of Dominic and Mary McGlinchey, two dedicated republican socialist activists from the south Derry area.
"Declan dedicated himself in the past couple of years to rebuilding the Irish republican socialist movement in the south Derry area. He was involved in helping to set up a new IRSP Cumann there, and was instrumental in establishing a vibrant and effective Teach an Failte and the Martyrs na hEireann flute band.
"He will be a huge loss to the R.S.M and our thoughts are with his family at this terrible time."
Mr McGlinchey's father Dominic, a former INLA Chief of Staff who was nicknamed Mad Dog by tabloid newspapers, died after being shot by two men in front of his teenage son at a public telephone kiosk in Drogheda in February 1994.
His mother Mary was shot dead in 1987 as she bathed her two sons in their Dundalk home. Security forces linked her death to a republican feud.
In 2009 Declan McGlinchey was cleared by Belfast Crown Court of terror charges, after a judge decided there was not enough evidence.
That same year he was arrested and questioned over the killing of Constable Stephen Carroll.