The couple met at a university rowing club
A British man being sought by US police after his American wife and baby were found shot dead has spoken to them from outside the country.
Officials said Neil Entwistle's car has been found at Logan airport, Boston. They would not give his whereabouts.
Mr Entwistle, 27, from Worksop, Notts, met wife Rachel at York University. On the couple's own website, they describe nine-month-old Lillian as "perfect".
Mrs Entwistle, 27, had been shot in the head, and daughter Lillian in the body.
Middlesex District Attorney Martha Coakley said there was a "high interest" in Mr Entwistle, but there were other people police wanted to speak to.
She said Mr Entwistle's whereabouts were known, but would not disclose further details.
"He had contacted police at one stage and we have been in touch with him since," she said.
The bodies of Mrs Entwistle and her daughter were found in bed at their home in Hopkinton, Massachusetts, on Sunday night.
They had only lived there for 10 days.
Mr Entwistle has been in contact with the authorities
The couple met through a rowing club when Mr Entwistle was studying electronic engineering with business management at the University of York.
They were married in 2003 and moved to the US shortly after their daughter was born.
Mr Entwistle was said to have been looking for a job in the technology field in the US.
His wife taught at St Augustine's Catholic High School in Hunt End, Redditch, Worcestershire between 2002 and 2005.
A spokeswoman for the UK Foreign Office said it was aware of Mr Entwistle's disappearance and was in contact with US authorities.
Nottinghamshire Police said the force was aware of the case but had not been approached to help in the investigation.
Head teacher Brian Rossiter of Valley School in Worksop, which Mr Entwistle attended, said he was an "ideal" student.
"We are stunned to hear he is being linked to this incident in Massachusetts," he said.
"People jump to all sorts of conclusions but the things that are being said are stunning the staff here."
The couple's website has been flooded with messages, some with prayers for the family.
One former pupil of Mrs Entwistle's paid tribute to a "lovely woman with not a bad bone in her body", while another wrote: "She was my theatre studies teacher for three years and she was absolutely wonderful.
"She brightened up every lesson with her great personality and will never be forgotten."
In the Entwistles' most recent posting on their website, they talked of looking forward to Christmas and of their daughter's baptism.
"The three of us are doing well and are looking forward to the coming holiday season," they wrote.
"The baptism was wonderful and Lilly looked perfect."
They signed off: "Love, the happy family."
The couple were reportedly due to host a dinner party on Saturday night.
But when friends and family arrived, it appeared that no-one was at home. Police were called the following day.
The district attorney's office, which is overseeing the inquiry, said both deaths were being treated as homicides.