<< Is it possible to cause a dead pixel (kill a pixel i suppose) by touching the LCD screen? >>
Maybe if you "touched" it with a hammer! Anything is possible but it is nearly impossible that you damaged the screen by touching it.
It's pretty common for LCD panels to have either "dead" (always off) or "stuck" (always on) pixels. Dead ones are less annoying than stuck ones, I think. And most manufacturers won't replace a panel unless it has a bunch of defective pixels spread accross the screen or several defective pixels in a small area.