Uranium235
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"It's best not to venture into certain areas of the city at night... However, Evil Lizard apparently didn't know that, as he only recently arrived. Although the street he was walking on seemed completely empty, death was already inevitably approaching him. Closer to morning, the townspeople found Evil Lizard lying motionless on the road. Strangely, there were no wounds on his body. The bag with medicines that he usually carried was missing, most likely stolen by marauders."
There is no clue because the Mafia used a faceless disguise (who would doubt it). Congratulations to the Town on their second protection against murder.
"He was relatively lucky. I came across a poor fellow this morning who had about half of his organs removed. Could it be that a maniac has appeared in this backwater town?"
"Naturally, after such events, the locals were agitated. Various strange rumors appeared about the pranks of steppe spirits, and some used this to their advantage. So, someone superstitious agreed to conduct a cleansing session, and, strangely enough, he actually felt better afterward."
"Self-suggestion, as it is."
"The military, who recently settled in the city, also reacted to the latest events. According to rumors, they caught someone and are now keeping them under surveillance."
The Mafia isolated someone.
"This is what happens when there is no clear authority in the city. The military has only just arrived, and they are already doing whatever they want..."