A 63-year-old Swindon man has been arrested for causing death by careless driving after a cyclist died on Whitworth Road last night.
Despite paramedics desperately trying to revive the man, he had sustained serious injuries and died at the scene.
Police closed the road for six hours and the driver of the van was arrested and bailed pending further investigation.
Officers in the case are now urging any witnesses to come forward to try and piece together what happened.
Anyone with information is asked to contact PC Trafford at the Serious Collision Investigation Unit at Wiltshire Police on 0845 408 7000, or anonymously, on Crimestoppers 0800 555 111.