Police have had a breakthrough in the investigation into the murder of David Liam Johnson after taking one man in for questioning and seizing a vehicle.
Shortly after the arrest forensic officers and major crime detectives raided a nearby home.
The dark coloured station wagon was taken for further forensic testing, and several items were removed from the home.
Police confirmed a man was assisting with their inquiries into the murder of Mr Johnson, who was 32-years-old.
Mr Johnson was found in Swanbourne's Lime Kiln Field, near a North Street home, about 11.30pm on March 8. The park is close to Swanbourne beach.
On Saturday, detectives revealed Mr Johnson appeared to have been struck by a car before he was shot.
They released a description of a dark coloured station wagon on Sunday, and on Monday they said security cameras in the Swanbourne area appeared to show a Mitsubishi Magna station wagon.
Mr Johnson most recently lived in Fremantle and was described by his family as a caring and kind-hearted larrikin.He was known to frequent the Fremantle, Rockingham and Mandurah areas and had a friendly disposition.
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