- O'Donnell wrote 10 romance novels under the pseudonym "Madeleine Brent"; his identity remained a secret until 1991.
- Announced his retirement from writing the "Modesty Blaise" comic strip in April, 2001.
- He is survived by his wife, Constance; two daughters, Jill and Janet both of Bromley, Kent England; three grandchildren and four great-grandchildren.
- Son of Bernard O'Donnell and brother of Roy O'Donnell.
- He served in a signal regiment in the British Royal Army assigned to France, Persia, Iraq, Syria, Lebanon, Egypt, Italy, and Greece.
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