This is the only photo of the Ecuadorian serial killer William Wladimir Cumbajín Bautista (born 1971) - known as William Cumbajín - that reveals his looks. He took great precautions in hiding his face, presumably not because of shame of what he did to (at least) nine murdered women from 2002 to 2003 in Quito, Ecuador, but to protect himself when he got caught.
In many ways this coward was the prototype of a serial killer of women, but in other ways his targeting homeless, poor and sick women makes him stand out as something special: He didn't go for victims who excelled in beauty or sex-appeal, but social, psychological and physiological vulnerability.
What had these women done to him to deserve what he did to them? Nothing on a personal level, but what he did to them reveals the same deep seated hatred of women and the female sex as such that other male killers have exhibited. It makes him interesting in a world of the all too many men who have committed sex-related murders that he took such great pain in mutilating the genitals of his victims. To me it's obvious that he was fascinated by the very femaleness that at the same time may have felt like a threat to his masculinity.
It is known that his mother was an abusive alcoholic and her abuse may have led to some kind of damages, physical as well as psychological, that made him hat women the more. However, to me it looks like a somewhat too "handy" excuse for what he did ....
He lured the poor and homeless women to come along with him by pretending to be a friend. That may have been easy as they were uneducated and most of them didn't have either family or friends. He gave them small gifts which made them trust him and his fake friendship. Then he drove them to the bushed in the Outskirts of Quito. Here he raped, tortured, mutilated their genitals before strangling them. When he was caught in 2004 he was sentenced to 25 years in prison which is ridiculous when considering the gravity of his crimes. After all, some of his victims had been tied up and tortured mercilessly before the murder. Something he told the police officers who investigated the murders gave him pleasure.