A man who raped and murdered a 15-year-old schoolgirl told police he "switched" and attacked her with a brick after drinking shots of vodka mixed with rum, a court has heard.
Landscape gardener Stephen Beadman, 29, told officers he became a "totally different person" after downing around 12 shots of spirits before he raped and killed Kayleigh Haywood.
Beadman pleaded guilty to charges of murder and rape - but denies holding Kayleigh prisoner at the home of his neighbour, Luke Harlow, between around 9pm on Saturday and 3am on Sunday November 15.
Harlow, 27, also denies the false imprisonment of Kayleigh, who was seen being pinned to the ground by Beadman on a footpath in the early hours of November 15.
A jury has heard that Kayleigh, from Measham, Leicestershire, was raped by Beadman in a car park after "escaping" from Harlow's home in George Avenue, Ibstock.
Beadman, also of George Avenue, then killed the schoolgirl, whose body was found in a hedgerow on the outskirts of Ibstock on Wednesday November 18.
The sixth day of a trial at Nottingham Crown Court heard that Beadman confessed that he had been involved in Kayleigh's death hours before her body was found.
In extracts of police interviews read to a jury of six men and five women, Beadman said: "Me and Luke were drinking in the kitchen, probably from about 10pm to the early hours of the morning.
"There is a lot of stuff that I don't remember."
Beadman told police he was telling them what had happened because he wanted "closure" for Kayleigh's family.
Describing his own state of mind on the night of the killing, Beadman also told detectives: "This other Steve, when I have alcohol, get stressed, is a totally different person. It's like I black out.
"When I drink I just switch. But when I switch I get violent. I wasn't in full control because I had been drinking."
According to Beadman's account, elements of which are disputed by the prosecution, he attacked Kayleigh after she struck him with a brick as they walked across a field.
"She literally just pushed me and I just switched," Beadman told interviewing officers.
"I fell to the floor and got up and went after her and basically just hit her over the head with a brick.
"I just threw the brick on top of her and she died. Then I panicked and ran off.
"I do know what I did was wrong. There is no ifs and buts. I will pay the consequences."
After confessing to the killing, Beadman, who was arrested at about 3am on Monday November 16, offered to take police to Kayleigh's body.
But he earlier told two detective constables that he had no idea where she was and hoped nothing had happened to her.
The killer originally claimed to have met Kayleigh for around four hours after being invited into Harlow's home, but said he left at about 11.55pm and gone home.
According to his original account, Kayleigh was "steaming" drunk, could not stand up, and had to be helped to the toilet.
Beadman told police: "It got to a point where she couldn't handle the phone. She wasn't there but she was awake and she was just like laughing and stuff.
"She said to me 'Who are you?' and she said 'I have got school on Monday'."
The trial continues on Friday.