A street in Grantham is still cordoned off this morning following the collapse of a man who later died.
The man in his 40s was reported collapsed in Inner Street just after 12.30am. He later died in hospital.
Officers would like to hear from anyone who may have been in the area around the time in case they have information that is relevant to the enquiry. Anybody with information should call the non-emergency number 101, quoting incident 9 of January 20.