I'd be easy to catch with some detective work, but here's what I'd most likely do.

If I saw a picture which location was decently close by, and I recognised it, I'd try to find who the person was that took the picture. I'd go through a list of thousands upon thousands of potentials, and then once I'd narrow it down as much as I could, I'd interact somehow, and ask them if they're "prosnipexxx" on whatever site the picture came from. The whole process would take a shit ton of time, and there'd be camera footage of me doing the observations, and hundreds of witnesses every day, but I'd like to do my killing that way.

The actual killing would probably be a shot to some vein, or poison in food. I wouldn't put much thought into that.

Edit: Also, there's no way that I'd go through with this. Too many chances, and too many risks.

I'd spear a shovel at someone while riding some faggy little scooter.

CAN YOU DIG IT
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I'd go full Vlad The Impaler, only instead of spears I'd use gigantic dildos.

If the only reason that you aren't a murderer is the risk of being caught, then you need serious help.

I'd leave random Yu-Gi-Oh cards behind and leave everybody wondering what the hell I was thinking.

I'd have to wrist blades and decapitate them predator style.

Blood for the blood god.

Smoke people out until they get so high, they have a heart attack.

Stab someone to death with an icicle

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