A body is removed at the train station, after a murder inquiry was launched following the stabbing of a man on board a train, in Horsley, Surrey, England, Friday, Jan. 4, 2019. British police are searching for a suspect after the fatal stabbing of a man on a suburban London train. British Transport Police said a man was killed Friday on board a train traveling from the town of Guildford to London Waterloo. (Steve Parsons/PA via AP)

A body is removed at the train station, after a murder inquiry was launched following the stabbing of a man on board a train, in Horsley, Surrey, England, Friday, Jan. 4, 2019. British police are searching for a suspect after the fatal stabbing of a man on a suburban London train. British Transport Police said a man was killed Friday on board a train traveling from the town of Guildford to London Waterloo. (Steve Parsons/PA via AP)

LONDON (AP) — British police on Saturday arrested a suspect in the fatal stabbing of a man who was killed in front of his 14-year-old son on a suburban London train.

Lee Pomeroy was on board a train from the town of Guildford to London with his son when he was stabbed multiple times Friday afternoon. Pomeroy would have turned 52 on Saturday, his family said in a statement.

Chief Inspector Sam Blackburn said the attack was “not believed to be a random assault.” He said the two men appeared to have been involved in an argument that escalated in the moments leading up to the killing.

ADVERTISEMENT

The suspect was detained early Saturday on suspicion of murder. A 27-year-old woman was also arrested on suspicion of assisting an offender.

Police said no one else was being sought in connection with the killing.

“Lee took his son on a trip to London hoping to spend some quality time with him which was cut short by (a) horrific and pointless attack,” Pomeroy’s family said in their statement.