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The police analyzed the bloodstains on the wire and found them to match the victim's blood type, ultimately confirming the wire as the murder weapon.
During the search, they found the same thickness of wire in Scar Brother's room, and also discovered leather gloves cut by the wire in the rooms of two "younger brothers" in the gang.
The trace comparisons were unmistakable.
The evidence linked together perfectly, and it was finally confirmed that the murder was carried out under Scar Brother's guidance by two adult members of the gang.
During the interrogation, in the face of conclusive evidence, the police quickly broke through Scar Brother's psychological defenses.
Although he had some cunning, the police had already seen through their murder methods. Scar Brother's excuses appeared feeble and powerless, so he ultimately had no choice but to confess.
The victim was an accountant by profession, and Scar Brother had been eyeing him for several days.