The Mormon church in a statement issued on behalf of Cochran's family said the couple was on the last day of a trip they had taken to see Europe in celebration of their 25th wedding anniversary, Newsday reported.
The terror attack claimed the life of Utah resident Kurt W. Cochran, family members said in a statement.
President Donald Trump reacted to Kurt's death, writing Thursday morning on Twitter that he was a "great American".
An American tourist from Utah celebrating his 25th wedding anniversary with his wife Melissa, he was struck and killed on the bridge.
He was a 75-year-old man who had sustained injuries in the attack, but police did not give any more details about his identity.
After mowing down pedestrians, the attacker crashed his auto into the gates of Parliament before jumping out and stabbing PC Keith Palmer to death.
Four people were killed in the attack, with more than 30 others injured.
Cochran's death was confirmed by family members and his church.
His wife Melissa is also seriously injured with a broken leg and rib, Payne wrote on Facebook.
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The couple had traveled to Europe to visit Melissa's parents, who are working as missionaries in the London Latter-Day Saints temple, and were planning to return home on Thursday.
Kurt was the first person she ever recorded her music with.
"Our hearts ache for her and their children in losing their loving companion and father". "While Melissa is recovering, I was heartbroken to hear that Kurt has since passed away from his injuries". Please continue to pray for our family.
A vigil has been held in London's Trafalgar Square for victims of the attack by the UK Houses of Parliament on Wednesday.
Making people feel comfortable with his warmth and compassion was the norm for Kurt, according to his friend of ten years, Jared Knierim.
"Addressing MPs, the prime minister described PC Palmer as 'every inch a hero and his actions will never be forgotten".
A GoFundMe page was established to help Payne Cochran; the couple ran a local recording studio.
Police earlier said that seven people were in critical condition.
"All our thoughts and our deepest sympathies are with her family", said Rachel Borland, the principal of DLD College London.