A scene snippet features him stepping on what appears to be an explosive of some kind as Kai Holman (Alex Tarrant) yells, “Jesse, wait, wait!” His warning is too late, however. A second later, there’s a fiery explosion, and fans are left to wonder what will happen to Jesse Boone. Some are already losing faith.
Source: https://www.distractify.com/p/is-noah-mills-leaving-ncis-hawaii