On: Biggest amateur-built sub sinks – owner is suspect...

[tyingq]

Could have been anything, including "not murder". Maybe, for example, an accidental death that Masden felt might not look accidental. All the way up to more nefarious motives.

The FBI has some data on circumstances/motives here: https://ucr.fbi.gov/crime-in-the-u.s/2010/crime-in-the-u.s.-... You can pretty quickly find a few that might be plausible.