The third victim of the Reading knife attack on Saturday has been named as David Wails.
Mr Wails was a senior scientist at a global chemicals company and a friend of the other two victims.
Joe Ritchie-Bennett and school teacher James Furlong were also confirmed to have died in the attack.
Three others were injured in the attack, which ended when a police officer tackled the alleged perpetrator to the ground.
One injured person remains in hospital in a stable condition.
A suspect, who is understood to be Khairi Saadallah, is currently in police custody.
Mr Ritchie-Bennett had moved from the UK to the US around 15 years ago.
His brother, Robert Ritchie, a captain in the Philadelphia police force, told the Philadelphia Inquirer newspaper : “We used to play together every day. We rode bikes together every day.
“Our family is heartbroken and beside ourselves.
“He did not deserve to go out like this.”
Mr Ritchie-Bennett’s father, also called Robert, said: “I absolutely love my son with all of my heart and all of my soul.”
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