I am not able to look at your armory, but unless you are decked out in PvP + sta gear, you will be 1-3 shotted in heroics. You shouldn't be taking hits anyway. I don't know the circumstances for which you died before the tank.(I don't want to make assumptions so I will cover the possibilities)
If you pulled agro you need to learn to control that. Give the tank a chance to get agro, get omen, misdirect. All agro helpers.
If you died from the mob you were suppose to trap, then that's something else. First, don't stand where you put your trap. Move back a few steps to a few yards. This gives a buffer zone, if the trap works, you are never touched, if it is resisted you have that much more space between you and the mob to use concussive shot or any other kiting tools to buy you some time to lay your next trap.
Learning to kite is key in heroics. You have to go into each pull thinking that there is a good chance your trap will be resisted and if that mob touches you, you will die, so you need to be on your toes every pull, and be ready to use your arsonal to keep that mob CCed and not touching you. Don't you dare touch that feign death button either. That's basically a "kill the healer" button in heroics.
Sorry I couldn't check the gear though, that's an important part of it to.