District collector K Dakshinamurthy today said headmistress Kanakavalli was yesterday suspended, two days after 9-year-old student Suriya succumbed to injuries.
Meanwhile, the District Primary Educational Officer held an inquiry into the incident, officials said.
Police had initially registered a case for voluntarily hurt and later altered it to section 302 (murder) of the IPC after the boy died at a hospital.
A fourth standard student Suriya died on March 5 after being allegedly attacked by two classmates over a quarrel about using his geometry box.