A man and a woman, both believed to be in their seventies, were pronounced dead at the scene of a crash on the A52 at Swaton at 3.30pm on Sunday, July 29.
Two cars were involved, a white Ford Ranger and a blue Nissan Note.
Police believe the couple are not local to Lincolnshire.
Officers are appealing for witnesses in the area around the time of the crash to call 101.
The road was closed for investigations and reopened at 11pm on Sunday.