In 1979 , Mountbatten , his grandson Nicholas , and two others were murdered by the Provisional Irish Republican Army ( IRA ) , which had placed a bomb in his fishing boat , the `` Shadow V '' , at Mullaghmore , County Sligo , in Ireland .
In 1979 , along with three other people , including a grandson Nicholas , he was assassinated by the Provisional Irish Republican Army ( IRA ) , which planted a bomb in his fishing boat , `` Shadow V , '' at Mullaghmore , County Sligo , in Ireland .