RN Collection: Mary Lou McDonald. Sinn Fein Vice President, Mary Lou Mc Donald, will be elected as the new leader and President of sinn Fein, to succeed Gerry Adams, in February 2018. End. 23/3/2017. Martin McGuinness Funeral. The coffin of former Sinn Fein and Provisional IRA leader and Deputy First Minister of Northern Ireland, Martin McGuinness, is carried shoulder high by Gerry Adams, Michelle O’Neil and Mary Lou McDonald through the Bogside in Derry City on its way to the funeral mass in St Columba's Church.Photo: Eamonn Farrell/RollingNews.ie