Igor Leonidovich Suvorov, a colonel (probably retired) of the 51st Guards Parachute Regiment of the 106th Airborne Division of the Russian Armed Forces, who was escorting cargo for Russian units in Donbas, went to Kobzon's concert.
Interestingly, Russian publics say that Suvorov died on the territory of the Russian Federation, near the border with Ukraine.
The details of his death are unknown.