Norfolk police officers are currently carrying out the exhumation of a body at Wisbech cemetery.
A spokesman for Norfolk police said: “An investigation has been launched, on behalf of HM Coroner, into the circumstances surrounding the death of Gertrude Frankham in Walpole St Andrew in December 2012.
“This follows concerns raised by her family to Norfolk Constabulary in April 2012. The exhumation is a planned operation as part of our investigation and has been carried out with the support of and in consultation with her family.
“We will then assess the results of the Home Office post-mortem and see how they can help inform the next steps in our investigation.”