Serving Metropolitan Police officer David Carrick, 48, has admitted to 49 offences.
The offences include 24 counts of rape after carrying out sex attacks on a dozen women over an 18-year period.
The Met has apologised to victims after it emerged PC Carrick had come to the attention of police over nine incidents including allegations of rape, domestic violence, and harassment between 2000 and 2021.
Carrick joined the Met in 2001 before later becoming an armed officer in the Parliamentary and Diplomatic Protection Command in 2009.
During his service, he faced no criminal sanctions or misconduct findings and was only suspended after being arrested over a second rape complaint in October 2021.
On Monday (January 16), Carrick appeared at Southwark Crown Court and pleaded guilty to four counts of rape, false imprisonment, and indecent assault, relating to a 40-year-old woman in 2003.
Whilst back in December at the Old Bailey, the Met Officer admitted 43 charges against 11 other women, including 20 counts of rape, between March 2004 and September 2020.
But denied a further count of rape in September 2020 relating to a 13th woman, whose allegation triggered the investigation.
Following his first guilty pleas, the Met stopped his pay and accelerated the misconduct process.
Detective Chief Inspector Iain Moor, from Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit, said the “sheer number of offences” showed Carrick’s “prolific and callous nature” and he expects even more victims to come forward.
Saying: "Whilst he was not a man that stalked the streets scouting for victims – he invested time in developing relationships with women to sustain his appetite for degradation and control – the coercive nature of his offending undermined his victims in the most destructive way."
Carrick admitted raping nine of the women, some on multiple occasions over months or years, with many of those attacks involving violence that would have left them physically injured.
It was also heard that some were locked in a small cupboard under the stairs in Carrick's Hertfordshire home for hours without food or forced to clean his house naked.
Carrick whipped one woman with a belt, urinated on some of his victims, and told them when they could eat and sleep.
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