A Melbourne mother found dead alongside her three children is believed to have killed her kids before taking her own life in what police are treating as a murder-suicide. The bodies of Katie Perinovic her daughters Claire, 7, and Anna, 5, and son Matthew, 3, were discovered inside their Tullamarine home on Thursday afternoon, sending shockwaves through the normally “quiet” community. Ms Pernovic’s husband, Tomislav, 48, made the call to emergency services and was questioned by police before he was released without charge. “Investigators do not believe the 48-year-old man was involved in the incident and police are not looking for anyone further in relation to the matter,” police said on Friday. “Homicide Squad investigators have formed the preliminary view that the 42-year-old woman is responsible for all four deaths and on completion of their investigation, a report will be provided for consideration of the coroner.”