A man has died after the car he was in lost control and crashed into the central reservation.
The 28-year-old victim was a passenger in a blue Mazda on the A17 in the direction of Sutton Bridge at around 10.20pm on September 23.
He was taken to hospital that night and died in the early hours of Wednesday, September 25.
A woman in her 30s, who was driving the car at the time, was also taken to hospital on Monday night with serious injuries.
Lincolnshire Police has asked anyone who saw the 08 plate Mazda before the crash or saw what happened to call 101, quoting incident 521 of September 23.