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Posted on the GMP YouTube channel the video shows a man in blue running backwards for his life as Wadsworth chases after him, slashing with the knife.

Today, Wadsworth was sentenced at Manchester Crown Court to life imprisonment, with a minimum of 32 years.

Senior Investigating Officer Duncan Thorpe, of GMP’s Major Incident Support Unit, said: “I would like to start by saying that our thoughts remain with Melissa’s loved ones - in particular her daughter who witnessed this incident. They are, understandably, devastated by what happened to Melissa. Specialist officers have supported them throughout our investigation and this prosecution. I hope today’s result provides them with a sense of justice.

“I would also like to commend the members of the public who tried to intervene. It takes incredible courage to put your own life at risk to save another’s.

“Wadsworth’s attacks on both Melissa and the man were extremely violent. Prison is the right place for him. I thank the investigation team and partner agencies, including the Crown Prosecution Service, for their hard work to ensure that Wadsworth was quickly arrested and has now faced justice. I hope during his time behind bars he spends a significant amount reflecting on his despicable actions."

WARNING DISTRESSING CONTENT: CCTV shows knife-wielding killer Andrew Wadsworth chasing a terrified member of the public