A member of a human rights organization has been murdered (Russia)

A member of a human rights organization, Mothers of Daghestan, has been found dead in Makhachkala, a source in the organization said on Friday.
Mustapa Abdurakhmanov, 42, went missing on Wednesday and his body was discovered a day later.

"A morgue employee told us that he (Abdurakhmanov) had been murdered," Ismail Butdayev, a member of the organization, said.

russian newsroom

I am not familar with Mothers of Daghestan. But this cannot be good. The article is not that long and does sum up what Mothers of Daghestan was established for:

Mothers of Daghestan was established to support the victims and their families of kidnapping or illegal detention by law enforcement officers. It also protects people who have been persecuted either for their beliefs or because of the actions of relatives.

Does anyone know anything more about this?

If I have placed this on the wrong board I appologise! If yes, mods please move to appropriate board.