Sounds more like a domestic squabble where the perp (apparently dead by suicide) retaliates against family or family-in-law.
Recall recently such a case of Bradley Stone in Sydney, PA who killed 6 family members at several different locations.
http://www.mediaite.com/tv/while-you-were-watching-sydney-pa-gunman-killed-6-and-is-still-at-large/
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Presser at 9:00 CT, unless rescheduled.
How did he retaliate if he was dead by suicide?
;-)