They just have to wait for her to make a slip.

Well, I guess she wasn’t the guilty one after all even though most would suspect otherwise. It’s perfect example of not to come too fast to any conclusion. Not everything is that obvious as it seems. Apparently it was a suicide and the doctor used the balloons filled with helium to get rid of the weapon. It’s really hard to believe what people are capable of. It was his life for god sake and all of it for the money he could have at the end.
Interesting story @greenrun!