All due respect to the deceased; I found some pictures, one of the pictures actually adds to the intrigue, I couldn't pass this up. I believe it is him without being able to read this.
https://novayagazeta-ug.ru/news/u25979/2017/08/29/142274Stanislav Dumkin. The articles say he was a blogger; he doesn't sound like a dissident. What is curious here, is the accused is suppose to be the son of a famous actor over there. The article which I google translated said the accused is thought to be mild mannered. But it apparently is on CCTV. It did not sound like Dumkin was current military.
Novaya Gazetta is suppose to be considered pretty good and has run afoul of Russian authorities in the past per freedom of the press.