A jobless man has admitted to the murder of a 15-year-old girl whose body parts were dumped in a supermarket trolley on a council estate in south London.

John McGrady, 48, snatched Rochelle Hollness at knifepoint after she called her boyfriend from a public phone booth in Catford last September.

He strangled her, cut off her arms and legs and wrapped her remains in five bin bags, the Old Bailey heard.

Police officers found dumped among rubbish near a stairwell on the Milford Towers estate, where McGrady lived.

His neighbours called 999 when the 48-year-old man cut his wrists and confessed to his girlfriend, then 47, that he killed Rochelle.

By that time she had been missing for three days.

Her father, Denroy, went to look for her, but found out she was dead when he stumbled across police on the murder scene.

McGrady, a heavy drinker, was arrested after receiving treatment for minor cuts to his arms.

He is due to be sentenced to life on May 15.