The brutal killing of Regina Siller at the hands of ISG is a grim testament to their ruthless enforcement—remorse was never an option for them. Even trained by the group, she stood no chance against their merciless strength. The murder is attributed to either Caio Henrique (Brazil's deadliest serial killer), Salvador Rolando (a sadistic enforcer and mass killer with a penchant for creative suffering), or Richard Ramirez ("The Night Stalker"—someone who lived to watch people scream) and by last... Ted Bundy (last person who saw her alive). Whoever did it... they made sure it hurt in ways that would linger beyond death itself. The grim event happened at August 16, 2025.