Lindsay Clancy, 36, stands accused of an almost unimaginable crime - murdering her three children, aged five, three and eight months, before trying to take her own life.

Warning: This article contains graphic descriptions of child killings, suicidal ideation, and an attempt to die by suicide.

The 36-year-old Massachusetts mother admitted to killing her children: Cora, 5, Dawson 3, and Callan, 8 months. Where does compassion cross a line?