There is documentation about animation cancelling methods but currently binding the tween to a variable and calling one of these methods on the variable does not work as intended. See the documentation to resolve this issue.
With TweenMax you can use the .kill() method but with TweenLite the method for cancelling animations is TweenLite.killTweensOf(yourTween), yourTween being a tween object.
Currently the animation cancellation does not work as intended related to: http://stackoverflow.com/questions/25360420/how-to-stop-tweenmax-animation-while-animating.
There is documentation about animation cancelling methods but currently binding the tween to a variable and calling one of these methods on the variable does not work as intended. See the documentation to resolve this issue.