This is the chilling recording of the emergency call a sadistic killer made to police just hours after murdering a teenage friend.

Remaining calm during the call, the controlling killer went on to outline a carefully constructed explanation of how teenager Breck Bednar died.

“I need you to send police and a forensic team to my address,” Lewis Daynes, 19, calmly said in the emergency call just hours after he had slit his friend’s throat at his flat in Essex, England.

Daynes said he and the 14-year-old had gotten into an “altercation.”

“Only one of us came out alive,” he said.

“I grabbed the knife and stabbed him in the back of the neck, I believe somewhere near the brain stem.

“I don’t remember exactly what happened but the fight ended with me cutting his throat.”

During the call, Daynes offered his name, age and address before claiming Breck had come at him with a penknife.

“I felt like taking my own life, I don’t remember what happened after that.”

“All I know is that I dropped the knife in my hallway and stripped down and sat in the shower.”

After giving his version of events, Daynes cut short the conversation, politely telling the call operator: “Thank you for your help.”

Police arrived soon after, finding him lying in the bedroom.

Officers discovered he had submerged his computer equipment in water to destroy any evidence of his crime.

They also found duct tape that was used to tie up his victim.

“He used his substantial computer expertise and his knowledge of the world of social media to control everyone he came into contact with in his virtual world,” Detective Inspector Anne Cameron said in court.

“He controlled access to this world jealously and spent a great deal of time building up his online person — pretending to be an entrepreneur in order to influence, coerce and control vulnerable teenage boys to exploit them,” she added.

“Daynes has shown no remorse whatsoever for his actions.”

A court today jailed Daynes for life. He will be required to spend a minimum of 25 years behind bars.