A man has been charged with murder in connection with the fatal stabbing of a 51-year-old father on a London-bound train on Friday.

Darren Shane Pencille, 35, from Farnham in Surrey, has been charged with murder and possession of an offensive weapon in connection with the death of Lee Pomeroy on board a train from Guildford.

According to witnesses the men were involved in a three- to four-minute row, moving through the carriage and into another before the attack.

Pomeroy, the owner of an IT firm, had been taking his 14-year-old son on a trip to London when he was stabbed to death on the 12.58 train service between Guildford and Waterloo on Friday afternoon. A 27-year-old woman, Chelsea Mitchell, also from Farnham, has been charged with assisting an offender.

Pencille was arrested on suspicion of murder at 6am on Saturday at a flat near Farnham hospital, along with Mitchell, after a manhunt led police to the property. Both have been remanded in custody and will appear at Staines magistrates court on Monday.

Police said they were not looking for anyone else in connection with the killing. On Sunday, police were given another 12 hours to question Pencille.

Detectives are continuing to appeal for information and have asked anyone who was on the train at the time, or who has dashcam footage of the Clandon area, near Guildford, after 1pm on 4 January, to contact them.

In a statement, Pomeroy’s family described him as a “devoted family man” and said he would be “deeply missed by all”.