Garza dies of a gunshot. This would be fine, except....
The "plot" (lol) up to that point had involved finding a nuke stolen by the Big Bad. Until it got to a point where suddenly the team was bundled off into the desert to find some special energy source for a Hellghast superweapon. Now, this, like everything else in that pathetic excuse for a game, was just a poorly constructed reason for the dev team to show off more setpieces and things they could stick in screenshots to keep the pricks in marketing happy. So, we get dragged off to the desert for some special ops bullshit (because apparently Guerrilla have forgotten what made the franchise seem so appealing to start with) and a bunch of stuff happens.
But then, towards the end, the Player and Rico (the lunkheaded foulmouthed annoying and altogether despicable shiteating excuse for a team leader who can barely be called a "character") find their teammates, held at gunpoint by the evil blokes. At this point, the Player and Rico set up an ambush so that they can fire on the guards with minimal risk to their teammates. Within a cutscene, the player character tries to act slightly professional and decides that they should move over a few meters to get a better position.
Rico, however has precisely one character trait. I suspect that trait was supposed to be "Loose cannon who doesn't play by the rules" but unfortunately, it comes across as "dickhead who should never have gotten past training". So in keeping with his usual manner of dealing with things, he swears loudly and starts spraying gunfire at place where everyone is, because apparently he's too much of a loose cannon to set up an ambush to avoid getting his friends killed.
Predictably, Garza takes a bullet in the chest amidst the following storm of bullets. He survives for a bit, but then gets one of the most unintentionally horrible death scenes in gaming history simply because it's so bad and mediocre that it starts being funny, but keeps going all the way back to "unfunny".
I shit you not, the player character tells him "DONT YOU GIVE UP ON ME SOLDIER" to which Garza responds with immediate death. The Player Character Responds to this with "NOoOOOO!!1!1!!"
There follows a section in the morgue where the player character goes "GODDAMNIT" and punches a wall. This is gollowed from Rico with "hey, man...". The player character's rubuttal to this is to say "BACK THE FUCK OFF" or something like that, at which point a compatriot steps in and implores his friend to "TAKE IT EASY, TAKE IT EASY MAN"
I swear, it's genuinely like what you'd get if you took a few jumped-up hair-gelled fratboy reality TV douchebags and asked us to believe that they were hardened spec-ops professional badass army vets.
And what consequence does this have on the plot or character relationships? none. Everyone stays the same, there is no difference made to plot. In case I didn't already make it clear, the writing in this game is comparable only to sewage and was used simply to string a load of selling points together for the benefit of the marketing dickheads. Suffice to say, asking us to feel emotionally involved when he died would have been a stupid joke. Far more likely Guerrilla just needed to pack in some "drama" to help sell the game.
