If I'm honest unless its a pick and play game, or at a convention worrying about character death is something I'd not worry about. If you are tosing the character sheets of you players out the window week in and week out, I'll be frank, you're not doing it right.
The purpose of the DM/ST etc is to weave the story, to make it fun for themselves and the players, to follow the story of the characters.. not to be scoring kills. I'm not leaping at you in particular here btw Tigirus (I don't even think you've insuiated anything,) its something I just personally felt I should raise regarding roleplaying and being a DM/ST in particular as you mentioned killing a character and this is a thread for a beginner.
To me One death every few month is sloppy, one death a month is bad news, any higher than that and its time to find a new DM as he's out to get your group.
Basically a characters death, unless in a game planned to be particulary dangerous, or if you are going for the sink or swim game. Should be thought out and not spure of the moment if you can help it. If you wheren't planning for a player to die, then fudge it, say it was a mortal wound, give the healer one more round to get there or worst case scenario have a npc save the day.
It shouldn't happen that often anyways, unless you are throwing creatures beyond there skill lvl at them. Sometimes all the fudging and last chance saves in the world can't save some characters mind you, but I loathe to kill them unless I have to (because they somehow blew all their safety barriers,) or it was something planned for, potentially could happen.
Myself I think the last time a PC died in one of my games was nearly six years ago in a Werewolf the Apocalypse game, although she died to save the rest of the pack. (Who where the other players.)
My view simple is, you don't get epic stories for your characters who you chat about years later, if they all got blown at the water before level five.
Just some thought for the fire.