It happened at around 12.30am on Saturday 14 April on Cookworthy Road.
A 19-year-old man was approached by a group of six teenagers who pushed him to the ground and kicked him.
The offenders are described as male, 15-16 years old and are believed to have been wearing dark clothes and hooded tops.
Man found dead in Exeter city centre
Exeter concede 10 goals as Man City demolish Grecians
Exeter City fans dream of glory in Manchester
Pleas for multi million pound road scheme to go further
Cathedral light show keeps audiences coming back
Pressure on hospital as icy conditions take toll
