When did pennywise die?

Pennywise, the iconic character from Stephen King's novel "It," dies twice in the story. The first death occurs in 1958 when the Losers' Club confronts him in the sewers of Derry, Maine, and the second death happens in 1985 during their final battle. Both encounters lead to his temporary defeat, as he is a being that can return. The character is ultimately defeated by the Losers' Club's unity and belief, symbolizing the power of friendship and courage.