Usage patterns
〈事〉が結末を迎えるfor something to reach its conclusion
The long dispute finally reached its conclusion.
結末をつけるto put an end to something, to settle a matter
I wanted to properly bring closure to the relationship between the two of us.
〈事〉という結末になるto end up in a certain kind of outcome
The plan ended in failure.
意外な結末an unexpected ending
This novel surprised readers with an unexpected ending.