A St. Louis, Missouri, police officer is accused of manslaughter in what authorities believe to be a Russian roulette game gone wrong, investigators said.

Authorities charged Officer Nathaniel Hendren, 29, with felony counts of involuntary manslaughter and armed criminal action in connection with the death of 24-year-old Katlyn Alix, prosecutors announced Friday.

The 29-year-old cop, who was on duty at the time, had allegedly been playing a game with Alix, who was off duty, around 1:00 a.m. on Wednesday at the suspect’s apartment, according to a probable cause statement:

Statement by @StLouisCityCA and charges regarding the homicide of @SLMPD officer Katlyn Alix. pic.twitter.com/cEryROo1kF — Circuit Attorney (@stlcao) January 26, 2019

As part of the game, the two would take turns pointing a gun containing a single bullet at each other before pulling the trigger.

Hendren initially pointed his revolver — which was not the same gun he used on the force — in the opposite direction of Alix. Hendren pulled the trigger, but the weapon did not fire.

When it was Alix’s turn to pull the trigger, again, the weapon did not go off.

Once Hendren took the gun back from Alix, he pointed the gun in her direction. This time, the weapon went off, sending a bullet straight to Alix’s chest.

Officers rushed Alix to the hospital, where doctors pronounced her dead from complications of her injuries.

Hendren, who worked as a police officer for the city of St. Louis for about a year, faces up to ten years in prison if convicted.