Police are trying to find out what happened to a man found injured and collapsed in a street in Southampton.
Jacek Stanislaw Kowalski, who is 42 years old and Polish, was discovered halfway off the pavement into Portswood Road in the evening of 7 December.
He remains in a coma at Southampton General Hospital but his condition is described as stable.
Officers have appealed for anyone who knows what happened to him to contact them.
Mr Kowalski was found by the B&Q store at about 2030 GMT and when police arrived a group of up to four people had stopped to help him.
Officers know he had been asked to leave the place where he was living in Burgess Road at around 1900 GMT but do not know what happened to him after that.
He was carrying a black rucksack and a travel bag along with a silver DVD player under his arm. However none of those items were found with him.
Police have asked anyone who thinks they know where they may be to get in touch.
They also want to speak to the group of people and the driver of a silver hatchback who stopped to assist Mr Kowalski before police arrived.
A woman on a bike who also stopped to help and said she was a doctor could also be an important witness and was urged to contact police.
Mr Kowalski is described as around 5ft 10in (180cm) tall, Polish speaking but can also speak English.
He was wearing a grey or black coat, grey hooded top, black and white tracksuit bottoms and a black Lonsdale baseball cap.