Well, the article states that they are looking to charge him with femicide. According to Wikipedia:

Femicide or feminicide is a hate crime which is broadly defined as “the intentional killing of women or girls because they are female”, with definitions varying based on cultural context. In 1976, the feminist author Diana E. H. Russell first defined the term as “the killing of females by males because they are female.” A spouse or partner is responsible in almost 40% of homicides involving a female victim.[1] Additionally, femicide may be underreported.[2] Femicide often includes domestic violence and forced or sex-selective abortions.[3]

The way he killed her and stuffed her body in a suitcase is just super messed up. Just a yikes all around. I doubt whatever motive he had is at all comprehensible