This film marks the final release of Bruce Willis (but not the final acting, as Detetive Knight: Independência (2023), filmed in November 2021, holds this dubious title), following an announcement in 2022 that he is retiring from acting due to being diagnosed with aphasia, later being updated to dementia.
Filming began on June 15, 2021, in Bessemer, Alabama.
On April 29, 2021, it was announced that Bruce Willis would star in Soul Assassin, a thriller film in which Nomzamo Mbatha and Dominic Purcell entered negotiations to star.
The film was re-titled to Die Like Lovers, and later retitled, Assassin.
In July 2021, Saban Films acquired the distribution rights to the film. In the same month, Barry Jay Minoff was cast in an undisclosed role, while Jeff Elliott was revealed to have produced the film, through Endless Media Brickell & Broadbridge International, alongside 120dB Films.