Tiago Henrique Gomes da Rocha, a Brazilian former security guard, is notorious for his confession to killing 39 people, earning him the moniker "the serial killer of Goiânia". His arrest revealed that he had committed at least 90 armed robberies in addition to the murders. During his interrogation, police officials were struck by his cold and calculated demeanor, describing him as a "monster in a deceptive mask" with a handsome and suave persona that belied his heinous crimes. His psychological profile and the circumstances surrounding his crimes have made him one of Brazil's most prolific and notorious serial killers. In prisons, he had several suicidal attempts, which highlights his psychological turmoils.