Detectives investigating a gangland execution in a supermarket car park have said they were keen to trace a van driver who may have important clues.
Police have been carrying out a "massive" investigation since Kevin Carroll, 29, was shot dead while he sat in the back of a car outside an Asda store in Robroyston, Glasgow, on January 13.
He is said to have had links with Glasgow's criminal underworld and survived an attempt on his life three years ago.