I follow news. You can google these facts. I don't have all the links at hand since it happened last friday.

1. A courtage of cops driving over the bridge with unmarked vehicle and a van inbetween that was posted by Mediazona and then repeated in propagandist's video. No one knew that his dead body was moved at that time.
2. It happened exactly one month before a future election.
3. Many officers of ФСИН were rewarded in a short period of time between his death and now.
4. People who tried to commemorate his death with flowers were imprisoned and charged, an order to observe monuments to political prisoners was leaked.
5. He was secretly driven to a remote location, quickly died there and then the reveal of a corpse was put to a later time to disperse any reaction, and he was once again moved.

That's not regular procedures.

There's no obvious benefits to that, as he had no power, so it's probably completely symbolical. Demonizing him and his peers even more can be a boost for elections though. And the way the state services act mysteriously there doesn't show they want one truth, but a polarizing event that'd harm opposition and approve the position held by his support base.