Based on what?
The guy is a loon, saw something he always wanted and couldn't have.
In a fit and jealous rage he shot that beautiful woman.
This guy was no pro. They found him on the street about a mile away.
The illegal Mexican who admitted he was looking for work wrapped a gun in a t-shirt, walked halfway out onto a pier, attempted no robbery, shot her three times, shot no one else including her father standing right next to her, and left. That's a hit.
I suggest you avoid crime fighting and psychology as professions, although you'd probably do great as a writer in Hollywood.