A teenager has been charged with the murder of another young man who was on his way home from a school prom.
Patrick Sharp, 18, is accused of killing Kajetan Migdal, also 18, who died from his injuries in hospital after an attack on Cuttys Lane, Stevenage at about 23:20 BST on Friday.
Hertfordshire Police said Mr Sharp was also charged with possession of an offensive weapon and class A drugs.
He appeared at St Albans Magistrates' Court and was remanded in custody.
Mr Sharp, of Cuttys Lane, Stevenage, spoke only to give his age and address and he is due to reappear at Luton Crown Court on Wednesday.
In a statement, Mr Migdal's family said they were "devastated" and he would be "greatly missed by all who knew him".
His aunt Corrie Everett, who has set up a fundraising page online for funeral costs, said her "handsome, talented, smart" nephew was on his way home from his prom.
Mr Migdal's school, the Saint John Henry Newman Catholic School, also confirmed the assault happened after the Year 13 prom.
The school opened its chapel on Sunday where "family, friends and staff came together to remember Kajetan".
It said the main school would open on Monday to offer counselling to pupils.
The school's head teacher, Clive Matthew, said Mr Migdal was "a continual source of pride for the school and was well known for his love of dance".
"He was a member of Prospects Fraternity, the dance troupe that captured the hearts of the school and the nation, doing so well in the BBC's The Greatest Dancer show in 2019," he said.
Det Insp Justine Jenkins, from the Bedfordshire, Cambridgeshire and Hertfordshire Major Crime Unit, said: "Our thoughts remain with Kajetan's family and friends at this extremely difficult time.
"Specialist officers are continuing to provide support to his family and we once again ask that their privacy is respected."
She added that officers were "still appealing for any witnesses who haven't yet spoken to police to please come forward".
Det Supt Michael Trotman said: "I understand that news of this incident will have come as a huge shock to the community and our thoughts are with all those who have been affected.
"If you have any concerns at all, please do not hesitate to contact your local police Safer Neighbourhood Team.
"A charge has now been secured and it's vital that the case is allowed to proceed through the courts unimpeded."