Neil Entwistle, whose wife and infant daughter were shot to death in their Boston-area home, is in his native England and apparently has no intention of returning for their funerals, according to CBS News legal analyst Wendy Murphy.
That, she says, is just one of several reasons detectives from Massachusetts are in England, seeking to question Entwistle, who's been labeled a "person of interest" in the case.
The bodies of Rachel Entwistle and nine-month-old Lillian Entwistle were found in their home Sunday.
Murphy, a former prosecutor who worked for many years in the office of Middlesex County District Attorney Martha Coakley, says Coakley is "very close-lipped about the nature of the investigation and what exactly is going on. She's incredibly tight-lipped about the motive. But she has revealed a couple of things.
"For example, Neil Entwistle has basically revealed that he probably won't be returning for the funeral of his wife and baby. That's pretty suspicious. No question about that.
"She also revealed that Neil didn't wonder about where his wife was. I mean, she was basically dead for a few days. He wasn't the one calling police, wondering how she was doing. People had to find him, in response to which he made phone calls back to law enforcement. But she was reported missing by people in this country. I think that's a bit curious, that a husband who should be in regular contact with his wife and baby is apparently overseas on some kind of trip and has absolutely no interest in wondering about their well-being."
The timeline is also noteworthy, Murphy says. Authorities think they've narrowed the possible time of death of Rachel and Lillian.
Murphy adds that there is surveillance video of Neil at Logan International Airport, leaving the country but, "We're not hearing the specifics about when he exactly got on a plane. But make no mistake about it: After 9/11, Logan Airport is very good at tracking people. So I'm sure they know exactly when he got there and exactly when he got on the plane.
"There's a little bit of overlap. At this point, it's possible he was gone before they were, in fact, executed. But I think that probably, he was here in the country at the time they were killed."
Murphy says Neil being dubbed a "person of interest" is significant.
"After the Richard Jewel Olympic Park bombing case, which led to a lot of lawsuits because of the use of the word 'suspect,' prosecutors routinely don't call someone a suspect. (Person of interest) is very strong language though. To call someone a person of interest does suggest that he's more than just a mere witness."
Murphy says it would take an indictment in the U.S. for British authorities to extradite Neil.