There is a large article in the Lowell Sun on February 5, 1912-"Shot Wife and Self"-"Tragedy in Walker Street Home Sunday Afternoon".
It is a two page article with a picture of the wife.
However the type is so grainy I cannot read it on-line. I suggest you write to the Lowell library and ask the reference librarian to make a copy from their archives.
I would have her also check the next day for more infomation and the obit of both.
Pollard Memorial Library
410 Merrimack Street
Lowell, MA. 01852