Joseph Trevor, 19, today pleaded guilty to the murder and rape of Megan Newton in Stoke-on-Trent in April last year.
He strangled her unconscious and stabbed her to death, Stoke-on-Trent Live reports.
Megan was attacked after she invited her killer to her flat – which was in a supported housing complex – because he was too drunk to go home.
Adrian Keeling QC, prosecuting, told Stafford Crown Court: “He raped and murdered her in the early hours of April 20. He did so at her flat.
“She invited him back as an act of kindness. He got so drunk on drink and drugs and could not go home to his parents.
“He raped her and stabbed her in the back eight times.”
Trevor was later seen walking to a bridge on the A500 with his legs the wrong side of the railings.
Megan was living at a supported housing complex run by charity Arch, which tackles domestic abuse and homelessness.
Tributes were paid to avid Stoke City fan Megan, who was a keen footballer and coach, following her death.
Samantha Duckers added: “We’ve spent the whole weekend wishing and praying it wasn’t you Meg.
“We are all devastated at your loss and the football community will never be the same without you.
“The girls and staff at Stoke Town are in shock but we will never forget your time with us. Thank you for lighting up our lives, we will miss you Meg.”
The killer initially pleaded not guilty to the charges at a hearing last summer, but today pleaded guilty to murder and two charges of rape.
In a statement after her death, her family said: “Our hearts are broken. Meg was a beautiful young woman who had everything to live for.
“She was in the prime of life, so precious and loving. We adored her.
“She was into sport in a big way. She loved playing football and used to give up her weekends to work as an assistant coach for the under 7s.
“She loved working with children and was studying sports at college as well as holding three jobs down at the same time.
“Meg had plans for the future – she was so independent and knew what she wanted to do with her life.
“We were all behind her every step of the way and would have done anything for her.
“She was a young woman in the prime of life, so precious and loving and such a big part of our lives.
“Family meant everything to Meg and we’re all struggling with what’s happened. It just doesn’t feel real.”
At the time, floral tributes were left outside the flats where Megan’s body was found. One read: “Rest in paradise, you angel.”
Stoke City supporters held a minute’s applause for Megan before last season’s Premier League match with Norwich City.