Born in Glasgow, Mary Ure was the daughter of civil engineer Colin McGregor Ure and Edith Swinburne. She went to the independent Mount School in York, and trained for the stage at the Central School of Speech and Drama in London. Known for her beauty, Ure began performing on the London stage and quickly developed a reputation for her abilities as a dramatic actress. Ure was known principally as a stage actress. She made her London debut as Amanda in “Time Remembered” (1954). While performing a leading role as Alison Porter in Osborne’s play Look Back in Anger (1956), she began a relationship with the married dramatist; after he obtained a divorce from his then wife, they married in 1957. In 1958, she was in the Broadway production of Look Back in Anger and earned a Tony Award nomination for Best Dramatic Actress. In the 1959 film version of the play, Ure reprised her role with Richard Burton as Jimmy Porter. By this point, her marriage to Osborne had become strained due to multiple affairs by Osborne and a diminishing respect for her acting abilities and stable upbringing. In 1959 she began an affair with actor Robert Shaw, her co-star in The Changeling at London’s Royal Court Theatre. She gave birth to a son, fathered by Shaw, while still married to Osborne. She divorced Osborne and married Shaw on 13 April 1963 after which Shaw legally adopted Colin, who then became Colin Murray Shaw. The couple had three more children.

She transferred her fragile, captivating portrayal of “Alison Porter” from stage to screen in the 1959 film adaptation of Look Back in Anger (1959), which also starred Richard Burton and Claire Bloom. In 1960 she appeared in the film Sons and Lovers as Clara Dawes, and was nominated for both the Golden Globe Award and the Academy Award for Best Supporting Actress. In this period, she also performed a season at Stratford and, while pregnant, The Changeling at the Royal Court with Robert Shaw. In 1963, after an absence of three years, she returned to cinema screens with a performance in The Mind Benders (1963) with Dirk Bogarde, a thought-provoking sci-fi drama. Then it was The Luck of Ginger Coffey (1964) and the flawed Custer of the West (1967), both with Shaw. Neither of these productions made a significant impact, though Ure performed admirably.[citation needed] In 1968, she had a role in Where Eagles Dare (1968) with Richard Burton and Clint Eastwood. It was a box-office success, but it would be five years before Ure’s next and last film appearance, in 1973’s A Reflection of Fear (1973) co-starring her husband. Ure continued to perform on stage during this time; however, her personal life had become difficult again and her growing alcoholism affected her career to the point that she was fired from the 1974 pre-Broadway production of Love for Love and was replaced by her understudy, Glenn Close. Ure’s mental health had been deteriorating since the early 1970s. On 2 April 1975 she appeared on the London stage with Honor Blackman and Brian Blessed in an adaptation of the teleplay The Exorcism, and after a disastrous opening night was found dead aged 42, from an overdose of alcohol and barbiturates, by husband Robert Shaw in their London home.