은 죽었고

(someone or something) died, and…

→ 은
phrase Common #1,556
(someone or something) died, and… A sentence fragment consisting of the topic marker 은 attached to a noun or name, followed by 죽었고, the connective form of 죽다 (“to die”). It introduces a contrast or continuation, such as “X died, and…”; the exact meaning depends on context.
KO: 사우론은 죽었고, 그의 군대는 흩어졌어요.
EN: Sauron died, and his army was scattered.

브라운은 죽었고

Brown is dead, and

— 저수지의 개들 (1992)

브라운은 죽었고 블루는 몰라

Brown is dead, and Blue doesn’t know.

— 저수지의 개들 (1992)