A man who was on the run for 18 years has pleaded guilty to a so-called honour killing.
Tabraz Mohammed, 39, has admitted murdering Soheil Mumtaz, 24, on 4 April 2001.
Mr Mumtaz was repeatedly hit over the head with a hammer on Kenilworth Road, Luton, over the defendant's sister.
Mohammed was extradited from the US to the UK in August and is due to be sentenced at St Albans Crown Court on 3 December.
Mr Mumtaz is believed to have worked with Mohammed's sister at a biscuit factory in Luton. He died five days after the attack which took place near his home.
Det Ch Insp Justine Jenkins, from the Bedfordshire, Cambridgeshire and Hertfordshire major crime unit said: "This vicious attack was orchestrated on a husband and father in retribution for a perceived slight in remarks made, of which there is no direct evidence, to a member of Mohammed's family.
"These were remarks not heard directly by Mohammed; in fact he didn't know if they were even true."
Mohammed pleaded guilty to murder at the Old Bailey. His address was given as Southwood State Prison, New Jersey.
There were angry shouts from the public gallery as Mohammed was remanded in custody.