Michael

Michael is an original character and minor antagonist who appeared in The Hell that Walks: Season 1.

Pre-Apocalypse
Nothing is known about Michael's life before the apocalypse.

Post-Apocalypse
At some point, Michael joined up with Penelope's group.

O'Death
Michael makes his only appearance arm wrestling Leon, which he wins only after Penelope distracts Leon. As a result, Penelope orders Terrance to kill Leon, but Leon is able to pull Michael in front of him and cause him to get shot in the head, killing him instantly.

Killed Victims

 * Numerous counts of beasties
 * Possibly numerous survivors (Direct or Caused)

Death
Killed by: When Penelope forces Leon to arm wrestle Michael, she shoots at Leon, distracting him and causing him to lose. Penelope requests that Terrance kill Leon, but Leon pulls Michael in front of him, causing Terrance to accidentally shoot Michael in the head, killing him instantly.
 * Terrance (Accidentally)
 * Leon Dawson (Caused)
 * Penelope Marshston (Indirectly caused)

Penelope Marshston
While not interacting much, it can be assumed since Penelope trusted Michael enough to arm wrestle Leon and she was infuriated after Michael's death that had a certain degree of trust and care for him.

Leon Dawson
Michael showed no remorse when Leon was forced to arm wrestle him, and Leon apparently returned to feelings when he didn't hesitate to pull Michael in front of him to prevent his own death.