It does look a little unusual. I guess there are a few possible scenarios here including but not limited to structural failure, wake turbulence, physical or mental impairment due to CO poisoning.
As more facts are made public it may become obvious to the pilot community what the most likely cause is. If not, then we do the usual and wait for the accident report.
It seems there have been a rash of accidents in the last couple of weeks. Can't help wondering if the great weather is drawing out the less than current pilots. (this is not intended to be speculation on the cause of this particular accident)
My condolences to those who knew those lost in this accident.