I Am Banging a Drum Repeatedly On This

 Pittsburgh, Penn. (1948)

04/13/1948: The mother, 32, was “under a physician’s care for melancholia since the birth of their fourth child.”  She shot to death all four children, then herself.

Category: family

Suicide: yes

Cause: mental illness

Weapon: pistol[1]

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[1] "Mother Kills 4 Children, Then Self," Bakersfield Californian, Apr. 13, 1948, 1.

Why?  Every mother murdering a child is heartbreaking.  Postpartum depression can be treated.  Do not ignore symptoms of depression in a new mother.  Be there for her and encourage her towards talking to her doctor.