Lincolnshire Police are appealing for information about Sonny Grey, who died from injuries sustained by robbers at his home on Westwick Gardens, in Lincoln.
Officers have now launched a murder enquiry and are appealing for information about the incident as well as about Grey himself.
DCI David Wood explained how details about the 70-year-old Lincoln victim could help piece together leads concerning the incident itself.
Wood said: “We want to know who Sonny Grey was and what he did, we are looking for the public to tell us more about Sonny as well as any information on the specific incident.”
A large amount of cash and jewellery was stolen from the house and Wood also appealed for people to be vigilant of anyone suspicious trying to sell jewellery.
“If the jewellery doesn’t seem to match the story behind the seller and it seems suspicious contact the police,” said Wood.
“We are unable to release details of exactly how Mr Grey died at this time, but he was subjected to a disturbing level of violence and his injuries were extensive,” he added.
Police are looking for three potential suspects who are all white males around 6ft tall believed to be wearing hoodies at the time.
The incident took place between 6:30pm and 7:45pm on Saturday and the victim, 70-year-old Sonny Grey, died in hospital at around midnight last night.
Anyone with any information can get in touch with Lincolnshire Police or Crimestoppers anonymously to help the investigation.