Detective Senior Sergeant Christiaan Barnard thanked the public for their help with investigation.
"While an arrest has been made, there is still a range of further inquiries to be completed by the investigation team," he said.
"I am still very interested in any sightings since Thursday night of the white 1996 Toyota Corolla sedan involved in the incident."
Anyone with information is asked to call the police on 04 381 2000, or provide information anonymously through Crimestoppers on 0800 555 111.
Pawa was a father of three.
Police said his family were "hurting and grieving".
They are not ready to speak about Pawa's death and have requested privacy.