Police have made a fourth arrest over the alleged robbery of an Ashburton man who was found dead last week.
The body of Arran Gairns was found in a drainage run-off area in a commercial district on Sunday 1 June.
A 46-year-old was arrested on Saturday charged with assaulting Mr Gairns with intent to rob him.
Police believe an attempted robbery of Mr Gairns occurred the day before his body was found.
The arrested man will appear in the Timaru District Court this Monday.