Who knows if they really cheated? Again we are talking about bets here. Probably the victim won fair and square but the suspects do not want to lose their waged cash. They chose the easier route- which is to slay these poor victims in the process.
Perhaps the murderers
noticebelieved to have noticed something off, like their victims being very lucky with their bets and winning money consistently, it could have been something fishy going on, but realistically there is also the possibility of those people who were killed just having enough luck to get consecutively winnings with those animals they betted on.
Whatever the case, it is very disturbing there are some cases in which one could get killed because one is being luck and there are criminals among the public who are willing to end our life, without having any evidence of any wrongdoing.
Anyways, one could just hope for those criminals to get prosecuted and eventually get justice served for the families of those victims.