Detectives from the Serious Collision Investigation Unit are working to establish the circumstances surrounding the incident and are appealing to the public for assistance.
Officers are urging anyone who may have witnessed the collision, or who has dashcam footage from the area at the time, to come forward.
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If you have information that could assist the investigation, please call 101 quoting reference 44240554969, or visit the Hampshire Police website to submit information: Tell Us About an Existing Case.
The incident has left the Andover community in mourning, with tributes pouring in for Ryan. Many have expressed their condolences to the Marshall family during what is an especially difficult time so close to Christmas.
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