Josephine Kaye was living alone when Amos Wilsher (29) posed as a worker to gain access to her home on February 27th 2020.
He then attacked her and stole her safe containing £20,000.
The 88-year-old, who was just 4ft 8, was thrown to the ground and threatened with a screwdriver during the vicious ordeal.
She was hospitalised with a broken leg and significant bruising before she later died from her injuries three weeks later on March 17th.
The prosecutor told Coventry Crown Court: “She was attacked in her home on that Thursday evening by one man, acting alone.
“He repeatedly threw her to the ground, he dragged her through her home and he threatened her with a screwdriver. He found her safe in a cupboard and demanded that she tell him the code, which she couldn't do.”
Josephine Kaye moved to Stoke-on-Trent from Dublin in 1955 after her husband was offered a job there.
Amos was also found guilty of murdering a second pensioner, alongside his brother Jason Wilsher.
The pair broke into the home of Arthur Gumbley in 2017 by smashing through a window in the kitchen door.
They violently beat him as he lay on the ground. He was then dragged across the floor, suffering carpet burns to his back.
His eyes, neck, chest, hands and arm were left badly bruised following the incident and had his wrist skinned when they forcibly removed his watch.
He also suffered injuries to his brain and was left with four displaced rib fractures.
The elderly man was left in a pool of his own blood before being rushed to the hospital for treatment where he succumbed to his injuries a few weeks later.
Amos was handed down two life sentences with a 38-year minimum term for the murders of Arthur Gumbley and Josephine Kaye.
Jason Wilsher was jailed for life with a minimum term of 25 years for the murder of Arthur Gumbley.
The brothers were also found guilty of wounding with intent and conspiracy to rob after a third pensioner was attacked at his home in November 2017, just four days after the raid on Mr Gumbley's home.
The home of Dennis Taylor (82) was broken into by three masked men who posed as police officers before he was beaten with a baseball bat.
The intruders ransacked his farm house before leaving the scene with £800 and jewellery.
He was lucky enough to survive the brutal attack.
Detective Chief Inspector Dan Ison, of Staffordshire Police's Major Investigations Department, said following the trial: “Amos and Jason Wilsher targeted elderly, vulnerable victims who lived alone.
“They ruthlessly and unnecessarily used violence which caused the deaths of 87-year-old Arthur Gumbley and 88-year-old Josephine Kaye."
“I would like to pay tribute to Dennis Taylor who survived an attack by the brothers and thank him for reliving the horrific ordeal he was subjected to which has been significant in helping secure their convictions,” he added.
“My thoughts remain with Arthur and Josephine's families and I thank them for their support of the investigation. During the trial, they have had to listen to the detail of what happened and have conducted themselves with dignity throughout.
“No sentence will bring back the lives of Arthur and Josephine but I hope the convictions will provide closure knowing that justice has now been served.
“Finally, I want to thank the investigative team who have worked tirelessly for four and a half years to ensure that these two men have been removed from our streets, resulting in not only Staffordshire being a safer place but also the West Midlands region where the brothers were operating.”