I think the show was treading water as it was. Bill's passing pretty much just seals the deal.

Game over man, game over.

What Casteevo said. Since the premiere, the ratings was dropping from 4.7 and below. I knew that the was potentially gonna get cancelled since CBS is strict with there ratings but after what happened to Bill, it really does seals the deal. Unless the ratings the ratings was really good then might had written out his character and add a new "boss" or probably still cancel it (who knows) but....

Ratings are terrible:

http://tvseriesfinale.com/tv-show/training-day-season-one-ratings

Very sad to hear about Paxton's passing, but this show was going to get cancelled regardless. It's ratings haven't been good.