Dunedin Police believe motorists or pedestrians may have evidence to assist a homicide investigation

A 25-year-old's been charged with murder, after a man was found dead at Great King Street on Friday afternoon.

Detective Inspector Shona Law says they'd like to hear from anyone on the street that day - particularly around 11am.

She says the area's busy during the day with cars and pedestrians - so dashcams or CCTV could have critical information.

People can upload footage to a dedicated web portal.