john noble , 53 , took his own life waiting in line at the m resort buffet .
shot himself in the head because his free buffet pass had been taken away .
had been awarded the biggest winner pass for the studio b buffet in 2010 .
it was revoked in 2013 after he was accused of harassing female employees .
the pass was confiscated three weeks after his mother passed away .
noble sent a local las vegas newspaper a 270-page suicide note and dvd .
posted increasingly rambling facebook posts prior to suicide pledging to discover ` the truth '