Mr Curran was found dead at his apartment in Cape Town earlier this month, after suffering multiple stab wounds.
The father-of-four had previously worked as a school principal in Dublin and was a former director of education at the Mellon Educate charity in South Africa.
The 24 year-old arrested in connection with the case is due to appear before Cape Town Magistrates' Court on Monday, charged with Mr Curran's murder.
