The helicopter, operated by one pilot and carrying a doctor and two paramedics, crashed in a forest near the village of Beleenki, about 700 kilometers (435 miles) east of Moscow, according to an online statement from Russia’s Emergency Ministry.
Rescuers initially only found three bodies at the site of the crash, but later located the fourth, the ministry said.
The authorities didn’t immediately say what may have caused the crash.
The Mi-2 is a small, Soviet-designed helicopter used for a variety of purposes.