I like to describe the scene and reflect how the audience would feel in the characters. Most of the times it’s better to leave some of the details out regarding the death and provide snippets unless you want to really point out a certain detail.
A red dagger piercing though her mother’s chest and the hooded figure whispering something into her ear.
“…David’s gone now. He couldn’t save you.”
He pulls the blood stained dagger from her chest with a silent slice and begins to turn towards Kristen. There is pure terror in her eyes as she struggles to comprehend what just happened. And in that moment all that came to mind was to run…RUN.