A trial is underway in Massachusetts for Lindsay Clancy, a mother accused of killing her three young children. The prosecution's first witness was Clancy's ex-husband, who testified on Monday. His testimony is set to continue on Wednesday.

Clancy is facing three charges of murder, but her defense claims she should not be held criminally responsible due to mental health issues. Her lawyer has stated that she suffered from postpartum psychosis and a severe mental illness at the time of the incident. Further details about the case and trial proceedings are available from the source, including the prosecution's opening statements and expected evidence to be presented in the coming weeks.