Anyway, whoever is behind all this should be punished and I hope the victims get the justice they deserve. I do not condone cheating in gambling but is killing really the way? Let us pray for the victims.
Of course it is not a justifiable act, and the perpetrator must be severely punished.
I do not know if cockfighting is legal or not in your country, or the perpetrator is the person who obtained permission to hold the gambling, but the lesson when we commit fraud to the wrong person, the result will be horrible, like the incident
Hopefully the police can really enforce justice because it could be that the perpetrator had a lot of money and used it to influence the investigation.