The victim went missing on May 25 and found dead 2 days after, half naked with a large wound on her genitals around 200 meters away from their house.
The suspect that was arrested is 51-year-old Edgardo Agoncillo who is a neighbor and a church mate of the victim's family.
But, he guaranteed that if proven guilty, he would endorse the suspect's execution by hanging.
"Gusto niyo kapag ma-implement iyan, hanap ako ng media, for show lang. Matingnan lang natin iyung effect kung paano mamatay ang tao sa hanging," Duterte said.