The world is overpopulated with zombies. 

Yup, right in the head no problem.

Oh yeah... I've been waiting to get back at my loved ones for one reason or another.. 
 
Seriously though, yeah pop goes the weasel, or zombie in this case, they aren't there anymore, they are just shells with an unquenchable hunger for human flesh or brains.. .45 right to the bean... BAM!

In the event of a zombie apoc, I'd turn into a heartless survivalist. 
 
You try to eat me, you get shot. No questions asked.

No one will kill them but me

This just proves to show that extended exposure to television and video games prepare us to do the most inhumane and morally questionable choices......

Without hesitation, i will

Nope, wouldn't do it.

" I'd take them out no problem. If they are a zombie, then they're already dead anyway. So two shots to the head, now you know they dead "

for sure , they would do the same for me  double tap straight into the skull

My family (mainly my father, brother, and I ) have been over this, and I think I'd get a little choked up at first, but they gotta go.
 
A walking corpse or a still corpse, the grieving of a lost one is still the same.

Easily, survival is a first, grieving can come later.

They WERE a loved one. No regrets.

I know for a fact that i would hesitate to shoot, but i'll most likely be able to do it... i hope lol

Really completely depends on the situation. The most important thing to do in case of zombie apocalypse is survive.... NOT KILL ZOMBIES. If i had the drop on them, and a silent weapon that wouldn't attract more zombies, and the time to do it, yeah, they would be put to rest. If I didn't have all of the above, no, I would escape, stay silent, or go do what else needed to be done in a timely manner.

" In the event of a zombie apoc, I'd turn into a heartless survivalist.   You try to eat me, you get shot. No questions asked. "

haha this thread reminds me of an amazing scene in the Edgar Wright classic Shaun of the Dead.
 
and yes i most definitely would.

After some moment of recollection,yes.

Most definitely. I see no reason to spare them just because their now-soulless bodies once belonged to those I loved.

YES I CAN

there not alive any way so i have no problem 

yup 
no problemo 
they are dead, its only their body 
one clean hack in the head

I am sure even the most loved one has done something to piss you off that you can use as an excuse to kill them.
 
If Jesus was a zombie, would you kill him?

yeah maybe hey if i turned on them i'll ask them to shoot me if they turned on me i would do the same thing 

I would be honored. I take it as a responsibility. 

 
yup i could no problem. shoutgun, machete, and a couple of assault rifles is all i need to survive.