Man accused of 1997 double murder warned a garda who approached him to stay away or he would kill her, jury hears

Mark Nash (42) pleaded not guilty at the Central Criminal Court to the murder of two women, Sylvia Shields and Mary Callanan, who died between 6 and 7 March 1997. The victims were residing in sheltered accommodation at a house attached to St Brendan's Psychiatric Hospital in Grangegorman. On 27 January 2015, three gardaí from Mill Street Station in Galway gave evidence about encountering Nash on the Tuam Road in…