Chris Baker, aged 29, of Albemarle Road, in the Southbank area of the city, has not been seen since around 7.15am on Thursday 20 December 2012.
Chris was driving to City Healthcare Partnership (CHCP) in Hull, where he works as an accountant, when he suddenly abandoned his grey Renault Megane at the junction of Skeldergate Bridge and Tower Street in York city centre.
He then gestured to a woman in the car behind him before jumping over the wall of Skeldergate Bridge into Tower Gardens, on the banks of the River Ouse. He has not been seen since.
Officers have been making extensive enquiries in an effort to locate Chris and are appealing to the public to come forward with information that can help the investigation.
Chris is originally from Burry Port, in Carmarthenshire, Wales, and moved to York with his wife six months ago.
He is described as white, around 5ft 9in tall, with a slim build and curly, dark brown hair. He was wearing a striped work shirt when he was last seen.
Chief Inspector Phil Cain, of York Safer Neighbourhood Command, said:
This is a very unusual set of circumstances and is totally out of character for Chris to act in this way.
It is clearly a very worrying time for Chris’ family, who he is very close to, and I am urging the public to help us locate him.
The police are especially keen to hear from anyone who was either on their way to work, walking their dog, or out jogging along the river bank between Millennium Bridge and King’s Staith at around 7.15am on Thursday morning.
Did you see Chris jump over the bridge wall? Did you see anyone behaving in an unusual manner in the area? If you did, you may have vital information that can help us to find Chris.
Anyone who can help officers with their enquiries is urged to contact North Yorkshire Police on 101 – select option 1 – and pass information to the Force Control Room.
Please quote reference number 12120213721 when passing information about this incident.