An Illinois mother had become “very invested” in the high-profile Lindsay Clancy murder trial before prosecutors say she killed her 2-year-old son on Tuesday, according to witnesses cited in court documents.

Lindsay Clancy is on trial in Massachusetts for the deaths of her three young children.

Corie Walsh, 40, was charged with first-degree murder after her son, two-year-old Barrett 'Bear' Walsh, was found dead in the basement of their Illinois home on Tuesday.