- Hassall was found by Suzanna Leigh in her Wimbledon cottage after she arrived to embark with Hassall on a holiday to Mombassa, Kenya. Hassall had recently been very depressed over the failure of her second marriage and her inability to find consistent, full-time acting work in several years. Police said she was found in bed, with a telephone in one hand and an empty bottle of pills in the other. Friends said that she had been hospitalized the week before for one of several suicide attempts.
- Both Hassall and her second husband, Andrew Knox died by presumed suicide.
- Shortly before her death, she described her second marriage to Andrew Knox as "a total farce," while other times she expressed despair over the breakup and divorce.
- Ex-daughter-in-law of Alexander Knox and Doris Nolan.
- Her second husband, Andrew Knox was at least three years younger than she was. Alexander Knox and Doris Nolan, parents of Andrew, were not married until December 30, 1944, and although Andrew's birth date is not known specifically, it would have been at least nine months after their marriage, and probably more.
- Her role in Carry on Loving (1970) led to her being depicted as a character in a play about the true life romantic escapades of the best known Carry On-ers (Sidney James and Barbara Windsor), entitled "Cleo, Camping, Emmanuelle and Dick," written by Terry Johnson. The play was produced in 1998 by The Royal National Theatre Company, on the West End at The Royal National Theatre, London, England, UK. Two years later, Terry Johnson adapted his play for a television movie, produced as Cor, Blimey! (2000).
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