A man who was stabbed to death on a train in Surrey in front of his 14-year-old son has been named as Lee Pomeroy.
His family have paid tribute to him on what would be his 52nd birthday after he was killed in a violent assault on Friday, describing him as a "devoted family man".
The married father of one was on his way into London with his son for a day out when the incident happened.
"Lee took his son on a trip to London hoping to spend some quality time with him which was cut short by horrific and pointless attack," his family said in a statement.
"Lee would have had his birthday today but did not get to see his presents. He was an honest, bright person, who loved music very much, he knew history and art and he was a bachelor of science in Maths.
"He was devoted family man and did everything for his family. He was an honourable man and would always help somebody who was in trouble. He was a loving husband and father, he will be deeply missed by all his family."
Mr Pomeroy was pronounced dead in the carriage at Horsley station after suffering multiple stab wounds in a "violent killing" on the train travelling between Guildford and London Waterloo.
On Saturday, officers attended an address in the Farnham area at about 6am and detained a man on suspicion of murder.
A 27-year-old woman was also arrested on suspicion of assisting an offender.
Police say they do not believe the attack was random.
British Transport Police Assistant Chief Constable Sean O'Callaghan told Sky News the men joined the train together at Guildford and a discussion occurred between them on the train.
"That continued for between three and four minutes," he said. "During the course of that discussion, both men moved to a second carriage, and that is where the violence ensued to the ferocity that we are now aware of and tragically that is where the man lost his life."
DCI Sam Blackburn, also from British Transport Police, said: "The investigation is moving with good progress and we are now confident to say that this is not believed to be a random assault. In the moments leading to the violent killing, both men appeared to be involved in an altercation lasting three minutes.
"Nothing justified the extraordinary violence that followed, and we are concentrating our efforts on the ongoing investigation."
The attack happened on the 12.58pm service travelling from Guildford to Waterloo. Officers were called to Horsley station at 1.15pm.
The victim's family, including his teenage son who was nearby at the time of the attack, are being supported by police officers, and a post-mortem is scheduled for early next week.
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The family are appealing for privacy at this difficult time as they come to terms with their loss.
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