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It sounds to me like you have Book 1 with four main characters, and Book 2 with only one of those characters continuing. Lots of series do this, including Narnia and Dragonlance. But, it's importa...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/37991 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/37991 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
It sounds to me like you have Book 1 with four main characters, and Book 2 with only one of those characters continuing. Lots of series do this, including Narnia and Dragonlance. But, **it's important that Book 1 work in its own right.** You don't want to get rid of major characters abruptly just because they're not going to be in the next book... You absolutely _can_ kill off main characters; please don't treat a character who dies as "less important" than one who lives. If/when you kill off a main character, you want their death to feel like it's got narrative significance -- e.g. an inevitable tragedy, or a sacrifice to accomplish something, or falling victim to a horrible enemy... you have many many options, but _build up to it_, make it mean something, because that character's life and death is its own plot-arc in your story.