First death in F:NV hmm? Not exactly my proudest moment really. It was just after the tutorial and that guy was like "Hey help my girl on the ridge cause geckos and stuff." So I was like "Ok captain dirty face, your totally trust worthy and not someone be suspicious of at all!" So I went up there tried to be sneaky but failed almost got killed by the geckos had a few health left and I got a little cocky see, I picked up one of the gecko heads and was holding it up in my screen and going "Haha tried to kill me but then I killed you, ya little dumb ugly thingy thing!" then I threw it away and strode up to that stash there and stepped in one of the bear traps and died.

I think my first death was suicide while trying to blow up Vulpes and his men. Then I reloaded and engaged them from a distance.

My first character death was in the fight with the Powder Gangers in Goodsprings. I was busy firing rounds at Joe Cobb that I wasn't paying much attention to the others. Three of the PGs threw dynamite at me at the same time and they were accurate. First time seeing my legless body flying through the air.

Well my first death was by a Deathclaw i've tried to punch him in the face very bad idea

Tried to kill Sunny to get her armor.(Back when I started game)
After 1 minute of shooting each other I got out of ammo and died...

death by Giant Radscorpion. when i pick the broc flower from the Goodsprings Cemetery, well i see it far away then i try to shoot it with my Varmint Rifle, though it can't scale mountain and ... 

Cazador, i hate Cazador, i tried to take a short cut to Vegas and like six of them came at me and it was to late.

Near gun runners the house with the broken door dont paying attention to the floor only thing i saw before i exploded in to a milion pieces a grenade brochet above me

I got killed at the ambush in Nipton Road pitstop, had no idea that was coming

The one and only deathclaw ripped me to death, when I forgot what a deathclaw was and it had me facepalming at the TV. Darn critters!

I got killed by the Powder Gangers at the showdown in Goodsprings :s

My first death was from me falling of a huge cliff. Lol

heading up north from goodsprings and got brutally murdered by a pack of deathclaws(near the quarry). one of the quarry workers warned me about that, but i completely ignored his warning

My first death in Fallout:NV is when i go to the hidden valley, alots of Radscorpions just came out of nowhere and attack me, kill 4 of them before i laid on the ground, why fallout guns so hard to shoot straight foward ?

Mine was on a friends game. He handed me the controller and left the room, leaving me utterly oblivious as to how to play the game or how it worked (I'd never really played anything other than Pokemon at the time). So I wandered around for a bit and ended up walking into a lake and drowning. Not my best moment I'll admit. Thankfully my skills have much improved but he does like to remind me of it every once in a while.

I cant remember where it was... Just outside goodsprings I think....

Died from Cazador poisoning XD

What @brandonpotter0 said^ - Died from a Cazador poisoning when i explored the area around Goodsprings my first time through the game.
I remember coming back to that area at level 27 and killed all the Cazzy's with the Avenger, good times.

My first death in New Vegas was by a Deathclaw when my friend told me to not follow the highway towards Quarry Junction and, like the idiot I was, ignored his advice. Scared the crap outta me too cause I didn't see him until I died.

I got attacked by a Legion death squad for the first time on my way to Boulder City. Being low leveled i tried to run away and ended up running straight into a pack of fire ants. I was crispy and full of bullet holes

I runed face first in bunch of cazadores with my 9mm pistol...and Vault suite...