Hmmmmm, I am really not feeling like the husband was involved. This is LA, after all, so his responses in interviews could be just that LA type of personality. In addition, his interviews were from around a month ago, so he might have thought more along the lines of Heidi being gone voluntarily.
What gives me pause are all the business entities in which she is named in some type of authoritative position, in addition to her last names being used interchangeably. She is Planck on some forms and Wayne on others (and yes, I checked that the Wayne name wasn't from when she was married). To me, those actions seem like they were done on purpose to try and mislead. I worry that she was caught up in something related to work.