Using viewpos does not always give you the right coordinates. I can't tell you why that is, but it troubled me in the past as well.
Anyways, this should do the trick.
PHP Code:
level.killtriggers[0] = spawnstruct();
level.killtriggers[0].origin = (-1616, 300, 87);
level.killtriggers[0].radius = 32;
level.killtriggers[0].height = 87;
level.killtriggers[1] = spawnstruct();
level.killtriggers[1].origin = (-1529, 300, 87);
level.killtriggers[1].radius = 32;
level.killtriggers[1].height = 87;
level.killtriggers[2] = spawnstruct();
level.killtriggers[2].origin = (-1462, 300, 87);
level.killtriggers[2].radius = 32;
level.killtriggers[2].height = 87;