British Transport Police
The 20-year-old died at Hillingdon Underground station.
Death on Hillingdon station platform after "altercation" with group of young men, police say.
British Transport Police are investigating the incident.
The 24-year-old was injured in south London on Sunday and died in hospital on Monday.
The teenager was on a train from London to Milton Keynes when the incident happened.
Louise Smith was travelling from Liverpool Street station when she received an unsolicited sexual image.
The man was refused travel by British Transport Police.
The victim suffered a fractured skull during the attack at All Saints DLR station.
The mayor of London paid tribute to the resilience and unity of the capital during the 2005 attacks.
58-year-old Michael “Spike” Lewis was "loved by everyone", while the death of 64-year-old Gareth Delbridge was described as "tragic".