Trying to identify a story of a robot suspected of murder on a fairly small planet.
The planet was initially uninhabited. The robot suspect and the man killed were part of the same visiting expedition.
Investigators have strong suspicions on the robot but also reservations since robot is not supposed to harm people(ala Asimov's 3 Laws of Robotics).
The solution turns out that the man had shot himself (by accident) by discharging his weapon and the bullet having traveled around the planet hitting him.
There was also the explanation for the robot's reluctance to be completely truthful to the investigators based on Laws of Robotics.
I imagine the author could be Asimov himself. (EDIT: I've gone over descriptions of his robot stories and no match could be found).
EDIT2: There might have been a romantic/jealousy angle to the story as there were two+ more astronauts (male/female) in the expedition. They were suspects too but robot was the most likely(if not for the Law of Robotics).
I read it in 1980s Soviet sci-fi magazine.