A Barnoldswick man died after he fell from the top of the multi-storey car park in Nelson on Saturday.
The 65-year-old, who has not yet been named by police, reportedly clipped a car as he fell.
Police are keen to speak to witnesses who saw the incident involving a dark coloured A-Class Mercedes.
The road at the junction of Sagar Street and Broadway was closed for a short time after the incident at around 5 p.m.
Anyone with information should call the neighbourhood policing team on 472441.