The state’s highest court has thrown out the alleged confession of a Northampton man who admitted setting a series of fires in the city, including one that killed a man and his father. The Supreme Judicial Court ruled Monday that state troopers made “misrepresentations” to Anthony Baye while interrogating him about the fires. The court says those misrepresentations included minimizing the crimes, and assuing Bay that he would get leniency if he admitted to setting the fires. The court overturned a decision by a Superior Court judge to allow the statements. Baye admitted responsibility for a series of fires in Northampton in December of 2009, including one that killed an 81-year-old man and his 39-year-old son who became trapped inside their burning home.