Derrick O'Connor (3 January 1941 – 29 June 2018) was an Irish theatre and character actor who trained at East 15 Acting School, London.

[1] O'Connor was best known for his performance as South African mercenary Pieter Vorstedt in Lethal Weapon 2 and for his roles in three Terry Gilliam films.

[2] He also appeared as Jack Stone in the British police drama series The Professionals in the episode "You'll be Alright".

[4] Gilliam, who directed O'Connor in three films, had noted in his audio commentaries that O'Connor seemed to have a habit of relinquishing most of his dialogue in favour of physical character humour.

[5] O'Connor died from pneumonia in Santa Barbara, on 29 June 2018, at the age of 77.