Series By Category Oxygen are :

Mark of a Killer
Mark of a Killer

All serial killers commit murder to satisfy their grand fantasies, but the murderers featured in this true-crime docuseries take it one step further, committing heinous acts that allow them to extend their fantasies and relive the excitement of their


Deadly Cults
Deadly Cults

Dive into unhinged murder cases in which investigators uncover and expose the dark world of cults that kill. The series explores how power and manipulation can lead to extreme actions.


Accident, Suicide or Murder
Accident, Suicide or Murder

Exploring the unbelievable true stories of suspicious deaths by retracing the investigation from start to finish, dissecting the red flags and undeniable evidence, and strange behavior that put the tragedy in question.