Gale Boetticher's apartment.
Breaking Bad Season 4, Episode 8
killed Gale Boetticher?
Breaking Bad Season 4, Episode 8
I believe in you, Gale.
Breaking Bad Season 3, Episode 13
Assume that Gale answered the door.
What happened after that?
Breaking Bad Season 4, Episode 4
And besides, you actually
did kill Gale, so there's that.
Breaking Bad Season 4, Episode 8