On 23 February 1960, two newborn babies died at the obstetric department while Fikáčková was working. Both newborns were females, aged 20 hours and 5 weeks, and the following autopsy found the babies had died an unnatural violent death. Four days later, on 27 February, Fikáčková was arrested directly in the workplace, and during the subsequent interrogation she confessed to killing the children. She admitted that both had their skull cracked, and broke one of their hands, and acknowledging she also used violence against a dozen other newborns, but those - in her words - survived the attack. During the investigation, Fikáčková confessed to killing at least ten newborn babies at Sušice hospital since she began working there in 1957.