Addressing MPs in the House of Commons on Thursday morning, the prime minister paid tribute to Palmer's service, saying "He was every inch a hero, and his actions will never be forgotten".
Kurt Cochran, 54, of West Bountiful, Utah, was thrown off the bridge and landed on concrete below when the terrorist's Hyundai SUV plowed through pedestrians in the shadow of Big Ben. Please continue to pray for our family.
The Cochran's were visiting London to celebrate their 25th anniversary and visiting Melissa's family, the BBCreported. Four people were killed in the attack, with more than 30 others injured.
"Our family is heartbroken", Cochran's brother-in-law, Clint Payne, said.
What started out as a trip to celebrate a Utah couple's wedding anniversary, ended in terror on Wednesday afternoon.
Murphy is headed to London to care for Kurt's wife who was seriously injured but is expected to recover.
Also killed was a mother-of-two who was hit by a bus as she ran to safety.
Keith Palmer, a 48-year-old father and husband, was the unarmed police officer on duty at the gates of Parliament when the attacker stabbed him to death.
Khalid Masood, 52, was born in the United Kingdom and had a criminal record, but wasn't previously suspected as a terrorist, authorities said.
"Kurt will be greatly missed, and we ask for privacy as our family mourns and as Melissa recovers from her injuries".
"We are ready to provide consular assistance to USA citizens in times of need, which is the embassy's top priority", the embassy spokesperson said in an emailed statement.
A Twitter account associated with ISIS has claimed responsibility.
A woman, 38, was arrested at an address in east London on suspicion of preparation of terrorist acts.
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