Dragon Ball Kai - episode 74 - 25 Sep, 2010

At Chi-Chi's suggestion, Krillin leaves the Kame House to intercept Bulma so he can obtain her shut-down device before Cell absorbs Androids #17 and #18. Unwilling to wait helplessly, Tien leaves the Kame House, as well, to help Piccolo on the battlefield. Meanwhile, #17 refuses to heed Piccolo's warnings about Cell, and is quickly defeated. Piccolo tries to ward off Cell, but Cell has become too powerful for him to handle. Cell quickly breaks Piccolo's neck, before blasting him through the chest at point-blank range, and then Cell tosses Piccolo's body into the sea. Then, Cell turns his attention to Android #17, intending to absorb him. (Source: Wikipedia)