Levy was on bail and being monitored by police when he committed a violent rape in January 2025.
He went on to kill Carmenza Valencia-Trujillo, 53, in March of that year and Sheryl Wilkins, 39, five months later.
Earlier this year he was found guilty by a jury at Inner London Crown Court of groping 10 women on the Tube and an 11th while in prison, but details of that case could only be reported this week at the conclusion of his murder trial.
Those offences took place between April 2022 at the prison, followed by the Tube assaults between 24 October 2023 and May 2025.
He had already been convicted of sexually assaulting two women in 2018, which he was jailed for in 2021.
BTP has confirmed two officers have been moved to other roles due to "incompetence" in handling investigations into Levy's transport assaults.
Lisa Ramsarran, chief crown prosecutor for the CPS, said: "Our actions fell short of the standards that victims, families and the public are entitled to expect."
Lisa Squire, whose daughter Libby was murdered by a man who had previously committed a string of sex crimes, told the BBC that a "catalogue of disasters" had led to Levy's murders.
She told BBC Radio 4's Today programme "the patterns were there, he was flying those red flags", and said there were "precursor offences" for which he could have stopped by police.
"At the moment, the message going out, in my opinion, is that women's safety is not important," she continued.
Zoë Billingham, a former independent police inspector who pushed for reforms on how violence against women in girls is policed, said that "too often in cases like this the dots aren't being joined up".
She added: "It's not one or two missed opportunities that could have brought him to justice, that could have had him locked up and behind bars and no longer a threat to women and girls. It was an extraordinary succession."

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