UPDATE 1.1
Update 1.1 is now available. The following has been fixed or added:
Fixed "Souls reaped" counter bug.
Improved vehicle reaping. You don't have to be right next to the vehicles now and peds vaporize in their vehicles.
Improved reaping from heli. Peds fly to underside of chopper instead of flying into the blades.
Added extended range when reaping from heli.

As always, thank you for your feedback and suggestions!

Premise
Some go quietly, some go with a scream. Some swoop into eternity with a whisper and others go out in a blaze of bloody carnage.

You are the Grim Reaper, driving along casually in your hearse along the streets of Los Santos gathering innocent lives of the people on the street! Need to
harvest the soul of someone driving a motorcycle? No problem! They come flying right off! Need to collect the soul of someone in a car? No problem! Just pull up next to them and POOF! they're eternal. Cops on your tail? Phase them into non-existence in an instant! You can even reap from the air. Reaping only works from a vehicle... for now.

Options
There are a number of options you can use in the GrimReaper.ini. You can set the reap radius and keys options in the file, and you can use specific keys in-game to change the reap strength. You can also set what character model you want the mod to spawn you as, if you don't like the default one. I'm hoping to add a grim reaper skin in the next update. Here are the ini vars:
REAPINGS = 0 (this is your tally and is updated as you go)
REAP_RADIUS = 30 (highly recommend you keep this below about 80)
PULL_STRENGTH = 5 (this is the speed at which peds will be pulled toward you)

Keys
ALT+N - Start/stop mod
G - Start/stop reaping
I - Invincibility on/off
ALT+NumPad7 - Increase reap strength
ALT+NumPad4 - Decrease reap strength

Prerequisites
ScriptHookVDotNet

Installation
Just copy the contents of this zip (sans README) to your GTAV scripts directory. If it doesn't exist yet, just create it and drop these files in it. Typically, the path to this is: ".\SteamLibrary\steamapps\common\Grand Theft Auto V\scripts\"