Assam Chief Minister Himanta Biswa Sarma declared on Monday that superstar Zubeen Garg's death on September 19 was a murder. "I will not refer to Zubeen Garg's death as a 'mishap' today. We need to submit the chargesheet in Zubeen Garg's murder before December 17," Sarma said. Garg died in Singapore in September.