Law & Order: Special Victims Unit (1999)

S4E14 Mercy

Detectives are devastated when they discover the lifeless body of a one-month-old baby girl hidden inside a cooler. As they delve deeper into the case, they uncover that the infant suffered from Tay-Sachs disease, a severe genetic condition. This revelation raises the unsettling possibility that her death might have been an act of mercy.