Two people have been charged after a 51-year-old man was stabbed to death in front of his son on a crowded train in Surrey.
Darren Pencille, 35, from Farnham, has been charged with the murder of Lee Pomeroy following the stabbing on Friday, British Transport Police said.
Chelsea Mitchell, 27, of Willbury Road, Farnham, has been charged with assisting an offender.
Mr Pomeroy was pronounced dead in the carriage at Horsley station after suffering multiple stab wounds in a "violent killing" on a train travelling between Guildford and London Waterloo.
A manhunt followed and arrests were made at a nearby address on Saturday morning.
Police say they do not believe the attack was random.
Mr Pomeroy, 51, who lived in Guildford and owned an IT firm, was travelling to London with his 14-year-old son when the incident happened.
His family described him as "an honourable man who would always help somebody who was in trouble".
Saying he had died the day before his 52nd birthday, they described him as a "devoted family man" who "did everything for his family."
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A British Transport Police statement said Pencille, of Willbury Road in Farnham, had been charged with murder and the possession of an offensive weapon in connection to a fatal incident on board a train from Guildford to London.
Both Pencille and Mitchell have been remanded in custody and will appear at Staines Magistrates' Court on Monday, it added.