disgraced nbc anchor brian williams threatened to make his departure from the channel ` really ugly ' , it has been reported .
the 55-year-old newsman is refusing to go down ` without a fight ' as he looks to return to his post on nbc nightly news , according to a source close to the network .
it comes after it was revealed that an internal inquiry found williams 's had lied in his reporting to make himself look good at least 11 times .