One Monday in 1979, 16 year old Brenda Spencer stayed home from school. She told her father that she felt sick and after he left for work, Brenda watched the elementary school across the street. Shortly after 8 am, as the children filed in, Brenda pulled out her .22 rifle, took aim and began shooting. She killed two adults and wounded many others including children and police officers. After 3pm, she simply turned herself in. 

Eventually she plead guilty, her sentence 25 to life with the eligibility of parole after 15.5 years. 

Brenda has been denied parole at least six times, but her next hearing will occur in 2028.

Sources:

https://www.sdcda.org/content/office/newsroom/tempDownloads/75bec742-da77-491d-af19-b1fbcef5c946_Brenda%20Spenser%20Denied%20Parole%20News%20Release%202-21-25.pdf

https://www.history.com/this-day-in-history/january-29/school-shooting-in-san-diego

https://www.cbs8.com/article/news/local/i-dont-like-mondays-school-shooter-denied-parole/509-113898c9-c56a-44b4-a64f-75167d82cadd