The death count due to sunstroke at the 'Maharashtra Bhushan' award event in Navi Mumbai rose to 13 after the death of a 55-year-old man while eight patients are undergoing treatment, a civic official said on Monday. The victims included nine women and four men. The award ceremony was held in the open ground in Kharghar area of Navi Mumbai on Sunday morning, which was attended by several lakh people, most of them followers of social worker Appasaheb Dharmadhikari who was conferred with Maharashtra's top civilian award by Union Home Minister Amit Shah.