The husband of the woman who died in a car crash on B1188 Sleaford Road in Metheringham on Monday, has died from his injuries overnight in hospital on Thursday.
The man was driving the Lexus car involved in a crash with a lorry on January 11 just after 9am.
The two passengers in the lorry were injured, but not seriously.
The deceased couple have been named as Ruth Dickinson aged 77 and her husband Brian Dickinson aged 82 from the Woodhall Spa area.
The investigating officers are still appealing for witnesses to come forward. This appeal includes anyone who saw the collision or who may have seen either vehicle being driven along prior to it.
Anyone who can help should call the 101 non-emergency number or the Collision Witness Hotline on 01522 558855. It would be helpful if they could mention incident number 84 of 11th January.