I will research closely, but one must remember i live where this happened. His house was/is on Naskeag Point in Brooklin Maine(next to the town of Blue Hill) i knew a family that lived in the house for some years.
I have been in the house.
And the story amongst the town folk was that it was a murder/suicide.
"This is where Jesse Livermore shot himself and his wife" type of story that has passed on thru the years.
It was, i am sure, a huge story up this way at the time, whether it got spun a bit i will seek out.
I will get hold of one the local town historians.