Kalinga Boli - One truly crazy case

Kalinga Boli was a Filipino head hunter who killed thirteen people in Tagan, Cagayan, Philippines between May 25 and June 6, 1937, before being arrested.

On May 25 Boli armed himself with a head axe and hacked to death his wife Kara, because he suspected her of infidelity. In the same manner he also killed four other triebesmen, as well as a Christian Filipino and afterwards escaped into the jungle near Abulug with a group of followers, vowing to kill at least 24 people. In retaliation to these murders relatives of his victims killed seven of his kinsmen, including three children, while Boli went to Kabugao, where he killed two people before fleeing.

Boli's gang, which was joined by his brother after he had wounded two soldiers and killed a number of dogs, hid in the mountains near Nagan. From time to time they left their hideout and raided villages for food, while Boli added new victims to his tally. At one point he killed three rice planters near Abulug, and on June 6 he slew two playing children in the village of Futtul.

Boli was eventually found and trapped in a cave by a detachment of eight constabulary soldiers, whereupon four additional constabulary detachments were sent to their aid. On June 10 Boli, who had been deserted by his followers by then, was asked to surrender by constabulary sergeant Pio Pilit, the brother of his wife, however, he refused and began to shoot arrows at Pilit without hitting him. When he ran out of arrows he came out of the cave and charged at Pilit with his axe, who then struck him down with his rifle butt. Boli was arrested, taken to prison in Kabugo, and later transferred to Tuguegarao where he was put on trial.

Source: the Amok Wiki article on Boli

Interesting. Why did he specifically wanted to kill 24 people? The case is crazy, though.