The 84-year-old suffered serious injuries in the incident, which occurred while he was walking home on 24 February.
He was taken to hospital but died on Sunday March 30.
Detective Inspector Simon Mills, of the Major Investigation Team at Cheshire Police, said: “The victim has fought so hard since the attack but sadly his injuries were too much, and despite the best efforts of the specialist medical teams who have supported him since the attack, he has now passed away.
“To endure such pain and anguish at the hands of an animal is unimaginable, and I cannot begin to comprehend the distress that his family are currently suffering following such an horrific incident.
“Nobody should have to go through what they have experienced, and our specialist officers are providing them with the support they need at this truly awful time.”
A 30-year-old man from Warrington has been charged with one count of being the owner of a dog dangerously out of control causing serious injury and two counts of possession or custody of a dog to which section 1 of the Dangerous Dogs Act 1991 applied, namely an XL bully.
The Crown Prosecution Service now has to decide if there are any changes to the charges.
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