The victims had been among the many poor Egyptians who risked their lives to find work in the lawless chaos of Libya following the downfall of Muammar Gaddafi in 2011 and civil war.
The Coptic Christians were beheaded on a beach in Islamic State's former Libyan stronghold of Sirte, wearing orange jumpsuits, according to a video posted by Islamic State.
Their bodies were recovered in October after the area where they were buried was recaptured from the militant Islamist group.
