Originally Posted by
Derek054 Hi Tiffany, have you got this worked out? Just wanna share a thought here, one of my geek friends told me that, once you've put anything online, it stays in the cyber, and however you delete it there's always a way to find it out. So I'm really cautious with these stuff. Anyway, good luck!

Welcome to Android Central

Not sure why nobody ever got to this post...
Anyway, to delete the photos from Google +, you need to be using the "Photos" app, and not "Gallery."
Sent from my Galaxy S4 running SlimKat 4.4.2