Grant Tiernan Amato (born May 20, 1989) is an American former nurse who was convicted of a familicide that occurred on the evening of January 24, 2019. Amato shot his father, mother, and brother Cody in the head at their home in Chuluota, Florida, while attempting to stage it as a murder-suicide committed by his brother before fleeing the residence. He was captured after a 24-hour manhunt, put on trial, found guilty and sentenced to life in prison without the possibility of parole.

Before the murders occurred, Amato had developed an infatuation with Bulgarian model and cam girl Silviya Ventsislavova (Bulgarian: Силвия Венциславова), who went by the alias "Silvie" or "adysweet" online. Amato used some of his father's and brother's money that amounted to $200,000 to pay to attend her webcam sessions. His family attempted to provide therapy and treatment by forcing him to a rehabilitation center. After a week of treatment, he returned home, where he argued with his father over continuing to contact Ventsislavova. This argument was revealed to be the deciding motive for the murders a month later.