Massod was last convicted in 2003 for possession of a knife, and was not the subject of any current investigations, Scotland Yard said. Five people died, including the attacker.
Watch more below on the latest from London.
Officials say Masood got out of his vehicle, went through the gates of Parliament where he stabbed a police officer to death. The 54-year-old sound engineer was flung on to the embankment below, possibly the first pedestrian to be hit.
Neighbor Michael Carney, who knew Rhodes for around 40 years, told Britain's Press Association he and his family stayed at Rhodes' hospital bedside until he died.
The other victims were identified as Officer Keith Palmer, 48 and Aysha Frade.
Aysha Frade, 43, of London was heading from her job as a Spanish department head at a local college to pick up her two young girls from school when she was struck and killed, the Telegraph reported.
Her Portuguese husband John Frade said his life has "completely fallen apart", said The Daily Mail.
"I had no, literally no, time to get out of the way", he said. He had served in the British army alongside Conservative MP James Cleverly, who tweeted: "A lovely man, a friend". "They just celebrated 25 years". Two of them remain in a serious condition.
After Palmer was stabbed, bystanders rushed to his aid.
Liverpool mourns the sudden death of Ronnie Moran
But the Merseyside club were rocked on Wednesday morning by the news that Reds legend Ronnie Moran has died at the age of 83. Left back Moran skippered the club to the old First Division league titles in 1964 and 1966 and the FA Cup in 1965.
Mark Rowley, the acting deputy commissioner of the London Metropolitan Police, earlier revised down the number of dead to three. She has been described as "highly regarded and loved".
'We love you Kurt. RIP.
A Utah husband and wife celebrating their 25th wedding anniversary are among the victims of Wednesday's terror attack near the U.K.'s Parliament in London, PEOPLE confirms.
Melissa Cochran was taken to hospital where she is being treated for a broken leg and rib.
The pair were in England to visit Mrs Cochran's parents, who are Mormon missionaries.
"Our hearts are broken this day as we say goodbye to our dear brother-in-law Kurt".
"We express our gratitude to the emergency and medical personnel who have cared for them and ask for your prayers on behalf of Melissa and our family", the statement added.
A GoFundMe page that aims to raise money to help Melissa Cochran while she's unable to work has collected more than $15,000 toward its $50,000 goal.