|Series lifespan||"Under the Dome (Novel)"-"Halloween Comes Early"|
|Cause of Death||Died in the bus trying to escape the firestorm|
Before the DomeEdit
Barely anything is known about his life except he lived in Chester's Mill and the fact that he called everyone 'pal'.
Under the DomeEdit
He is among the many residents to get trapped under the Dome.
He died while trying to escape the firestorm.
Despite the fact that they have only switched a few words in the novel, Sam seemed to find Leo annoying and told him to shut up when he started asking questions about the pink falling stars.
To be added