PA MediaScott Mills was questioned in 2018 over allegations of serious sexual offences against a teenage boy but the investigation was later closed due to lack of evidence.
The Metropolitan Police said a man, who was in his 40s at the time of the interview, was investigated over allegations reported to have happened between 1997 and 2000.
As first reported by the Mirror, the investigation - which began in 2016 - was dropped in 2019 after the CPS deemed there was insufficient evidence to bring charges.
On Monday, it was announced Mills had been sacked by the BBC over allegations related to his personal conduct. The BBC has not given any further details over the allegations and it is not clear what, if any, role the police investigation played in his sacking.
The BBC has been approached for comment about the police investigation.
After the sacking was announced, the BBC said in a statement: "While we do not comment on matters relating to individuals, we can confirm Scott Mills is no longer contracted to work with the BBC."
BBC News has approached Mills for comment.
Mills' last show was on Tuesday 24 March, which he signed off by saying: "Back tomorrow."
DJ Gary Davies started the show the following day saying he was "in for Scott Mills".
News of the 53-year-old's departure was first reported by the Mirror, which reported that it "understands the allegation relates to a historic relationship".
A Metropolitan Police spokesperson said in a statement: "In December 2016, the Met began an investigation following a referral from another police force. The investigation related to allegations of serious sexual offences against a teenage boy. These were reported to have taken place between 1997 and 2000.
"As part of these enquiries, a man who was in his 40s at the time of the interview, was questioned by police under caution in July 2018.
"A full file of evidence was submitted to the Crown Prosecution Service, who determined the evidential threshold had not been met to bring charges. Following this advice, the investigation was closed in May 2019."
Mills, who took over the breakfast show on Radio 2 from Zoe Ball in January 2025, has worked for the BBC for more than 25 years.
He earned £355,000 - £359,999 in the 12 months leading up until April 2025, according to the latest annual report, making him the corporation's 11th highest-paid star.
His full salary for taking over the breakfast show is almost certainly much higher and is likely to become clear when the next BBC Annual Report is published over the summer.
As one of the corporation's high profile names, his abrupt departure is a fresh blow for the BBC - the last for the current director general Tim Davie, who leaves the corporation later this week.
It comes after News at Ten presenter Huw Edwards was convicted in 2024 of making indecent images of children, and separately Radio 1 DJ Tim Westwood was charged in October last year with four counts of rape and nine of indecent assault. He will stand trial next year and denies the charges.
Mills joined Radio 2's weekday schedule in 2022 when he replaced Steve Wright as the host of the afternoon slot.
In 2025 he provided TV commentary on BBC One for the semi-finals of Eurovision with Rylan. He was last seen on TV in a Traitors skit during Comic Relief.
Prior to his work on Radio 2, he worked on Radio 1, which he joined in 1998. He hosted Radio 1's Official chart between 2018 and 2022, replacing Greg James.
He also hosted a weekend show on BBC Radio 5 Live and appeared on Strictly Come Dancing in 2014.
In an email sent to staff on Monday morning, Lorna Clarke, director of music at the BBC, said the sacking would "come as a shock".
She said: "Of course, it will also come as a shock to our audience and loyal breakfast show listeners too. I will update everyone with more information on plans for the show when I'm able to."
Scott Mills' abrupt sacking creates another headache for the BBC
Scott Mills sacked from BBC Radio 2 after allegations over 'historic relationship'
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