A FORMER University of York student who disappeared shortly before his wife and baby daughter were found murdered at their American home is believed to have returned to the UK - and may be with his family.

Neil Entwistle, 27, is thought to have been on a passenger list for a flight from Boston to London on Friday. Reports claim his BMW was found at Logan International Airport in Boston.

On the Entwistle family's website, a message from "Matt" in the UK, who claimed to be Mr Entwistle's cousin, said: "As far as I know, his Dad collected him as they live in England and he knows no one over there (in America).''

Neil Entwistle's parents, Clifford, 52, and Yvonne, 55, were not at their home in Worksop, Nottinghamshire, last night.

Lights were on at the detached house, in a quiet cul-de-sac, and a man, believed to be Neil's 23-year-old brother, Russell, was inside. But he refused to answer the door. It is thought Russell Entwistle had travelled to Worksop from his home in Leeds. A spokesman for Nottinghamshire Police said the force had not been approached by US police to help in the investigation.

Police investigating the double shooting said they had tracked down Mr Entwistle, who studied electronic engineering at York University, to a location outside the United States and spoken to him several times, but have still not labelled him a suspect.

The Middlesex District Attorney's office said there had been progress in the investigation surrounding the deaths of Mr Entwistle's wife, Rachel, also 27, whom he met on the rowing team when they both studied at York University, and their nine-month-old daughter Lillian.

Mr Entwistle is now at the centre of allegations surrounding mysterious internet dealings.

A spokeswoman refused to confirm or deny allegations that Mr Entwistle, an unemployed computer technician, ran a website offering "get-rich-quick pyramid schemes'' linked to internet pornography.

According to some computer expert websites and US newspaper reports, millionmaker.co.uk, which suddenly became unavailable yesterday morning, promised a profit of 6,000 dollars a month after six months.

The firm, which was registered to a Neil Entwistle at an address in Heslington Road, York, claimed to offer 24-hour support to adult internet businesses for a 90 dollar set-up fee and 25 dollars a month.

A seller on internet auction site eBay, which had received numerous complaints, is also registered to an N Entwistle, in Worcester.

Two messages of complaint on the seller's page referred to a Rachel Entwistle and appeared to offer a mix of computer software and information on mysterious get-rich-quick schemes.

One feedback message said: "Rachel Entwistle is a thieving liar, do not buy here.''

Another said: "Rachel Entwistle lives in Worcester 4 gods sake! Where's my goods?''

There were 16 complaints about services not being delivered in January, but only three in the year before.

The bodies of Rachel Entwistle, who once taught at a school in Worcestershire, and baby Lillian were found at the family's home in Hopkinton, Massachusetts, on Sunday night.

There was so little blood on the bed that at first officers thought they had died of carbon monoxide poisoning, but later found bullet wounds from a small-calibre weapon.

Updated: 09:55 Thursday, January 26, 2006