A 35-year-old man held on suspicion of murdering father-of-one Lee Pomeroy on a train is to receive a further 12-hour grilling from police.
Detectives have been granted the extra time to question him and a 27-year-old women accused of assisting an offender following Friday’s gruesome knife attack.
Mr Pomeroy had been taking his only son, 14, to London for a day-trip ahead of his 52nd birthday.
He was stabbed to death as his child looked on, on the 12.58pm service from Guildford to Waterloo, in what police called a “pointless and horrific attack”.
According to police, he and his killer became locked in a three to four-minute row moving through the carriage and into another which escalated into an “unprovoked, violent attack”.
The killer allegedly fled the train at Clandon station while the service continued to Horsley station, where police and paramedics attended.
In a statement released by British Transport Police, Mr Pomeroy’s family said: “Lee took his son on a trip to London hoping to spend some quality time with him which was cut short by an horrific and pointless attack.
“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 a devoted family man and did everything for his family.
“He was a loving husband and father. He will be deeply missed by all his family.”
Mr Pomeroy lived in Guildford with his 50-year-old wife Svetlana Pomeroy and their son.
The couple both worked for Datronix Systems Limited, an IT consultancy.
Mr Pomeroy is listed as a programmer and director of the company.
The accused killer was detained after a manhunt led police to a flat in Willbury Road, Farnham, in the early hours of Saturday morning.
Police have said they are not looking for anyone else in connection with the killing, while detectives are continuing to appeal for information.
British Transport Police asked anyone who was on the train at the time or who has dash-cam footage of the Clandon area after 1pm on January 4 to get in touch as soon as possible.