Zachary Quinto is set to star in assassin movie Agent 47.
The former Heroes star has been cast alongside Rupert Friend in the action film, reported Deadline.
Rupert took over the lead part earlier this year following Walker's death in a car crash in November.
It hasn't been announced who Star Trek actor Zachary will play.
Aleksander Bach will direct Agent 47, with shooting due to get under way in March.