The father of murdered model Sally Anne Bowman has appealed for help in catching her killer so he can lay his daughter to rest.
Paul Bowman, 42, said the killer was not of sound mind, but urged him to come forward to prevent more attacks.
Miss Bowman, 18, was sexually assaulted and stabbed to death near her home in Croydon, south London, last month.
Her murder has been linked to one sex attack, but it is thought the man may have carried out six more attacks.
It is thought the killer may have been lying in wait for Miss Bowman as she returned home after a night out in Croydon in the early hours of 25 September.
Mr Bowman said: "Having only just had her 18th birthday, she truly did have the rest of her life ahead of her.
"Now there will be no 21st birthday, no wedding, no first house, no children, no career, just this unimaginable, unfillable emptiness and a naked, throbbing, deep horrible pain that may well fade in time but will never actually go away.
"For someone to perpetrate a crime like this is obviously not of any kind of sound mind and if he has the slightest amount of decency in his body, he would come forward himself if only to prevent another one happening."
Miss Bowman was attacked just after her ex-boyfriend Lewis Sproston, 20, drove her home.
He has been cleared of any involvement in her death and Mr Bowman said family did not blame Mr Sproston over his daughter's death.
Miss Bowman's murder has been linked to other attacks
"Lewis is a young man and to be the last person to see her alive, God only knows what must be going through his mind.
"We blame no one but the perpetrator."
Mr Bowman said there had been overwhelming support for his family which had give them strength.
"It's amazing how something as dreadful as this does bring out your faith in human nature.
"People I haven't seen for years have been ringing and giving their support.
"I work in the construction industry with builders and some of them have been on the telephone in tears, grown men in tears because of the waste and the whole concept of what's gone on and how it's happened."