Lincolnshire Police has arrested four men in connection with the murder investigation of Sonny Grey.
Over the past three days, police arrested a 29-year-old man and two 18-year-old men in Cambridgeshire, and one 29-year-old man in Lincolnshire in connection with the murder.
The men are currently being questioned by police, and bailed pending further enquiries in February next year.
Sonny Grey (72) was murdered in his home on Westwick Gardens in October. He died in hospital of his burns, after being scolded with a kettle.
Police are appealing for more information regarding the death of Grey. They are also trying to recover jewellery stolen from the scene.
Anyone who believes they may have useful information should contact Lincolnshire Police on 101, or Crimestoppers anonymously on 0800 555 111.