India, Aug. 8 -- A court was informed that Susan Bertolo, the preschool teacher of Lindsay Clancy's daughter, witnessed unusual and atypical behavior in the young girl just one day before her tragic death at home.

Additionally, Amy Bevins, a longtime friend of Clancy, revealed that a few days before the children's deaths, Clancy had sent her a text expressing that she was struggling with 'dark thoughts' and was experimenting with new medications for assistance.

Clancy faces charges of murdering her children-Cora, five, Dawson, three, and Callan, eight months-using exercise bands in the basement of her residence in Duxbury in January 2023.

Susan Bertolo was also employed at Learning Sprouts preschool, where Cora and Dawson were enrolled...