An 18-year-old will appear in court today charged with the murder of a teenager who was stabbed to death while babysitting her young niece and nephew.
Chatherine Wynter, 19, had been looking after her sister's children on Boxing Day. Her body was found by her mother at 8am on December 27.
Tony Bushby, of Digswell Close, Borehamwood, Hertfordshire, will appear in court today, Hertfordshire Police said.
Ms Wynter, also known as Katie, was last heard from at around 7.30pm on Boxing Day.
The children, aged three and four, were in the house in Beech Drive, Borehamwood, at the time of the murder but were not injured. It is believed they could hold vital clues about the incident.
A post-mortem examination confirmed that Miss Wynter, who also went by the surname Briscoe and lived elsewhere in Borehamwood, died as a result of stab injuries.
On Wednesday night, a 26-year-old man from Islington, north London who was held in connection with the killing was released without charge.
Police have said both men were known to Miss Wynter, and her sister, but were not direct relatives.
Detective Inspector Carl Foster, from the Bedfordshire and Hertfordshire Major Crime Unit, said: "Whilst a charge has been made, a team of detectives continue to work on the case.
"As part of our ongoing investigations extensive searches by specialist officers have been carried out in the area surrounding Leeming Road and Gateshead Road to locate a black bin bag. It is believed there are clothes in this bag which we are keen to trace.
"I would like to appeal to people in Borehamwood for help in tracing this bin bag. If you have seen a bag in the area which you have found to be in an unusual place or believe there is something suspicious about it please call Herts Police on 101. Or if you do not feel comfortable calling police, please call Crimestoppers anonymously on 0800 555 111."
Bushby will appear at Hatfield Magistrates' Court.