“The Cleveland Elementary School shooting took place on January 29, 1979, in San Diego, California. Shots were fired at a public elementary school. The principal and a custodian were killed. Eight children and a police officer were injured. A 16-year-old girl, Brenda Spencer, who lived in a house across the street from the school, was convicted of the shootings. Tried as an adult, Spencer pleaded guilty to two counts of murder and assault with a deadly weapon, and was given an indefinite sentence. As of 2017, she remains in prison.
A reporter reached Spencer by phone while she was still in the house but had stopped shooting. The reporter asked Spencer why she carried out the shooting. She answered: “I don’t like Mondays” Wiki