I have wondered about the possibility of a family member of a patient. Some people have very passionate bias against gender transitioning and might be very angry at a professional who enabled, say, their spouse to transition. (For the record, these are not my beliefs AT ALL, but you see it all the time where family members turn their back on someone who is transgender.)
A neighbor, or anyone who might think the family was still out of town would make sense too. However, if that ends up to be the case, why on earth would the sheriff think that would be the twists and turns makings of a movie. He obviously was sensationalizing this crime, but wow, he'd be waaaaaaaaaay off it was just your standard break in gone wrong because someone was home.