In 1956, Ure began an affair with married Playwright John Osborne while working on the initial production of his play Look Back in Anger. The couple married in 1957, had son Colin in 1961, and divorced in 1963. Osborne had continued having affairs during the marriage, and Ure started an affair with her co-star Robert Shaw in 1959, while the two were performing in the London stage production of The Changeling. It is believed that Shaw was Colin's natural father. Ure and Shaw married in 1963, with Shaw immediately adopting Colin. Ure and Shaw had three more children together, Elizabeth, actor Ian Shaw, and Hannah. Ure and Shaw were still married when she committed suicide in 1975.