No it will not kill you but it can make you feel like you are dying or going crazy, expect
that as part of it. When it wears off there shouldn't be left over effects but if the experience was intense enough you might carry it with you for quite a while or forever.
Also it's not completely impossible to precipitate mental diseases by using DMT, I think but there would then be an underlying cause.
A choice to take this or not shouldn't only be asking if you can be absolutely certain that it will not have a massive impact on you. You can't ask if it theoretically safe and then assume that it couldn't change the way you think about things, change something deep inside you. Show you deep things.
If you have been researching all over the internet you should know a bit more about the dangers of psychedelics in general. Read the Beginners FAQ for a very general answer on that. I'm pretty sure it also holds true for DMT.
I wouldn't consider DMT dangerous but I would consider it incredibly powerful. And you can hurt yourself with that power if you don't do things right. On the other hand you can do beautiful things with it as well.