The Killer Bee was a brick red or red standard Bumble Bee with Killer Bee logos. Almost all were only obtained by winning a Playmaxx contest.
But I found two of these at the Playmaxx museum store in 1999. I was told they were used for promotional items, given to vendors at shows or to promote business. Not only the unique logo on the back, but these are GTs or butterfly shape. The only Killer Bees that I've ever seen in butterfly shape.