With the murder scene, you have to put the three actors together in one spot with the teleporter mod. I attached the gun accessory below.
Sometimes the height slider mod glitches, it's an easy fix by restarting the game. I always create my males to have the maximum height from this height slider mod while the female has the normal EA height. https://www.redheadsims-cc.com/2018/11/height-slider-collection.html
Enjoy :)