Inspector Colin Sutton and how he caught Delroy Grant (2025)

EX-Senior detective Colin Sutton caught serial rapist Delroy Grant following a large and complex investigation.

Here's what we know about the police officer who solved multiple high-profile cases.

Who is Colin Sutton?

Colin Sutton was an SIO in the Met Police from January 2003 to January 2011, leading more than 30 successful murder investigations – notably the Levi Bellfield case.

He was the lead detective on the Amélie Delagrange murder case.

The French student, who was visiting the UK, was murdered at Twickenham Green in London while walking home following a night out with friends.

She was found in the park on the evening of August 19, 2004, with serious head injuries, and died in hospital the same night.

How was the Night Stalker caught?

Grant was arrested on 15 November 2009, when police officers covertly monitoring the area of Croydon following attempted break-ins, found him walking back to his car after trying to enter an elderly woman’s home.

When Sutton was drafted in to solve the case, he applied the same techniques he had used when searching for Bellfield.

He decided to change tactics from using DNA, and instead set up a burglary squad of over 70 officers and deployed them in and around a street in Croydon where there had been regular attacks.

Sutton established an in-depth surveillance plan for the street and on their first night of watch,the Night Stalkerattacked three times, but each attack was just outside the area being watched.

However, police managed to catch the serial rapist running to his car on CCTV, and examined each frame to identify his vehicle.

Who plays Colin Sutton in Manhunt?

Martin Clunes plays DCI Sutton in ITV's upcoming series Manhunt, which looks at Grant's 17-year terror spree and the investigation that brought him to justice.

Manhunt: The Night Stalker will air at 9pm over four consecutive nights from Monday, September 20, 2021, on ITV.

How was Colin Sutton involved in the Amélie Delagrange murder case and catching Levi Bellfield?

Assigned to the case by the Met, hard-working Sutton dedicated himself to finding Amélie's killer.

Despite having very little evidence, his painstaking approach and the diligence of his fellow officers gradually led to breakthroughs in the case.

He and his team established that she might have been killed by the same person who had killed Marsha McDonnell 18 months earlier.

Marsha, aged 19, died after being beaten over the head with a blunt instrument near her home in Hampton, London.

Sutton's team solved the cases of Amélie and Marsha, both of whom were brutally killed by Bellfield.

In an interview with Crime and Investigation, Sutton said it was through “thorough and painstaking analysis of [thousands of hours of] CCTV images and mobile phone records” which helped provide the clues that ultimately led to Bellfield’s conviction.

He added: “Even though that was what made us suspect Bellfield, the complete lack of scientific evidence meant that there followed more than three years of patient case-building, old-fashioned detective work.”

Sutton said this helped “unearth small pieces of circumstantial evidence which, added together, formed the compelling case which convicted him”.

Following Bellfield's conviction, Sutton also connected the killing of 13-year-old Milly Dowler to the two young women’s murders, when the Met took over the investigation from Surrey Police.

Bellfield, now 52, was jailed for life in 2011 for murdering Milly and the two women.

What does Colin Sutton do now?

Sutton, who has retired in mid-Suffolk, has written about bringing the serial killer to justice in his book Manhunt, where he explains how he noticed a connection between the three murders.

He thrived “under the pressure” of hunting for the serial killer, finally bringing the violent murderer to justice “after the case had begun to seem hopeless”.

Sutton held the rank of Detective Chief Inspector in various roles for a total of 15 years in three different police forces.

Since retiring from the force, he has given technical advice to best-selling crime authors and TV screenwriters, worked for radio and TV, written about crime for national papers and, according to his Twitter account, is currently “procrastinating while writing book 2”.