Is Antonio justified in stabbing to death his rival Jose?

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THIS is a true story and the characters were intentionally changed for obvious reason. Antonio, his parents, well wishers all dressed up as well as the church personel were all gathered inside the church waiting for the bride to come to church so the wedding ceremony could begin. The waiting grew long and tense. Maria- the bride- failed to come. Not even a shadow of her appeared. Antonio- the bridegroom sensed something wrong. He rushed to Maria's residence but found her house empty. Somebody tipped Antonio that Maria was with Jose on a boat in the shoreline ready to elope. Mad with anger, Antonio caught in time the run-away pair. With his bolo, Antonio stabbed to death Jose, mortally wounded Maria and her mother Petra who acted as her accomplice. Please share your comments on this incident. Is Antonio justified in putting the law into his own hands? Why did Maria try to run away from Antonio and instead tried to elope with Jose? Is Maria's mother to blame for this untoward incident? How do you account Jose's participation in trying to elope with Maria?