Breaking Bad Season 1 Episode 3 : ...and the Bag's in the River
Walter cannot decide whether or not to kill Krazy-8. Meanwhile, Marie believes that Walter Jr. is smoking marijuana and asks Hank to scare him straight. Walter brings Krazy-8 something to eat, but things turn bad when Walter collapses while descending the steps into the basement. When Walter wakes up, he tells Krazy-8 that he has lung cancer and they start talking and get to know one another better. Eventually, Walter decides to release Krazy-8 but, upon realizing he intends to stab Walter upon his release, kills him instead.