A 23-year-old Sheffield man was arrested just hours after two suspects were detained following raids across South Yorkshire.
A South Yorkshire Police spokesman said: "The 23-year-old man from Sheffield was arrested on suspicion of murder, in addition to the two arrests this morning; a 30-year-old man from Sheffield and a 35-year-old man from Rotherham, who were also arrested on suspicion of murder remain in police custody."
Former soldier Tommy Ward, 80, died of his injuries earlier this year after being attacked by burglars at his home in Maltby, near Rotherham, on October 1, 2015.
The attackers took his life savings of £30,000 and left Mr Ward, who weighed just nine stone with a smashed skull, broken ribs and a fractured jaw.
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The great-grandfather of 15 died in February in Rotherham Hospital, where he had been receiving treatment since the attack.
Anyone with information is being urged to contact 101.