Serhiy Moskalenko was a former head of a security company who defected to the Russians after Putin's invasion of Ukraine.
He was appointed head of a detention centre in Russian-occupied Kherson region; a detention centre where allegedly "inhuman tortures were committed against captured Ukrainians", according to Kyiv's military intelligence.
A spokesperson for the Ukrainian Defence Ministry claimed Moskalenko had been "eliminated".
The exact details of the car bombing are not yet clear, but the explosion killed Moskalenko and injured his wife and daughter.
Ukrainian authorities suspect Russian involvement in the attack, as Russian intelligence services have been known to target defectors in the past.
According to The Mirror, Moskalenko was a "traitor" and "torturer", which suggests that he was seen by some as a collaborator with the enemy.
However, it is worth noting that this characterization is not universally accepted, as the article from Kyiv Post does not use these terms.
Nevertheless, the fact that he was killed in a car bombing points to the ongoing violence and instability in the region.