I understand where you are coming from, my brother… never stopped playing cops & robbers from childhood. Instead, he went into undercover narcotics & SWAT & straight from there to the Army doing counter-terrorism & espionage. So I understand seeing things that are gruesome & then needing to leave them at the door once you are home in your space.
I don’t have any specific spells or rituals for death specifically. This doesn’t sound like grief. I will look through what I have though for more specifically helping a spirit cross over peacefully that you could do in your 
The Inner Temple for Casting Spells without Tools.
I will get back to you in a bit. We are snowed in so it gives me something to research while stuck at my house for real. Lol 