This was a Saco, Maine shooting. It was on Water Street, on Saturday, July 26, 2014.
Police suspect that Joel Smith (33) committed a murder-suicide against his own family members.
Heather Smith was 35. Joel’s stepson, Jason Montez, was 12. He allegedly killed two biological kids, as well. Noah Montez was 7, and Lily Smith was 4.
There was no suicide note, but the family might have had financial problems.
There was no hard proof provided yet that Joel Smith did it. However, at least one person says that he threatened suicide recently. The belief he did it is apparently based on the positioning of the bodies, gun, etc.
https://bangordailynews.com/2014/07/28/news/portland/police-saco-killings-likely-murder-suicide/ (video posted)