Star Wars Behind the Scenes Photo: Greedo Unmasked

Greedo, the Rodian bounty hunter shot by Han Solo, was played by two actors in Star Wars IV: Paul Blake and Maria De Aragon.

Paul Blake played Greedo in the shots that feature both Greedo and Han Solo in the same frame. For Greedo’s close-ups, a new articulated head was built for pickups at the end of the shoot, and Maria De Aragon was enlisted to play the Rodian.
– Wookieepedia

[Retronaut]