Feeling unwell on Saturday 8 March 1958, Beattie had a violent heart attack on Monday 10 March. He received medical attention and was taken to Tyrone County Hospital where he died, being survived by his wife and children. His funeral on 12 March was said to be one of the largest ever witnessed in County Tyrone and the procession included 150 cars; Beattie is buried in Mountjoy Presbyterian Church in Omagh. His son Robin succeeded him as Treasurer of Dunmullan Unionists.