A 61-year-old Elizabeth line worker has died following an assault at an east London railway station.
British Transport Police (BTP) was called to Ilford station at about 20:50 GMT on 4 December to reports of a serious assault.
The man was taken to hospital with serious head injuries and later died.
Ayodele Jamgbadi, 28, of Kingston Road, Ilford, was charged with grievous bodily harm, affray and possession of a prohibited offensive weapon in a private place.
BTP has said its detectives will apply to amend the indictment to reflect the victim's death.
The RMT union said the victim, who was one of their members, was a customer experience assistant for MTREL, which runs the Elizabeth line.
General secretary Mick Lynch said: "We are deeply saddened by the passing of our member, who died following an attack while at work.
"The whole union sends its condolences to their family, friends and colleagues at this awful time and everyone's thoughts at RMT are with them.
"We will keep a close eye on legal proceedings and will comment further in due course when it is appropriate."
Mr Jamgbadi appeared at Highbury Corner Magistrates' Court on 6 December and was remanded in custody.
He is due to appear at Inner London Crown Court on Saturday.
DCI Paul Attwell said specialist family liaison officers were supporting the victim's family.
"Our thoughts remain with them at this incredibly difficult time," he said.
"I would like to reassure the public that this is an isolated incident. We are not seeking anyone else."