How does one make sense of something so horrible?

I worked with a nice lady on Monday. That night, her husband killed her. Her two kids (the youngest is 2) have no mother now. The man sits in jail. They were both from Afghanistan. She immigrated here many years ago and was a resident, with a job (part time job at a day care center). He came over more recently and had only temporary residency. They were having trouble and she reported his threats of violence to the police. That very day, she was killed. She wanted a divorce. That could have put his residency application in the government’s garbage bin. This man, it seems, would rather kill the mother of his child and spend the rest of his life in a Norwegian prison than risk going back to Afghanistan? I’m trying to wrap my head around it, but I just can’t. She was JUST THERE, working with us on Monday, in her new job… and now she’s gone. I’m angry and sad. Can anyone help me with this?