Sorry to be slow posting, Kathy. I was working with no Internet access all day.
I think you have a great opening scenario. Woman inadvertently witnesses a murder. (New Mexico is also a potential setting.)
Is this a romance? Who will be the hero? Someone has to help her? Does she run? Hide? Where? Who is the villain? As Cheryl asked? Drug dealer? Mob hit? Political execution? Who was murdered? Wife of a philandering husband?