Editing Ethan Crumbley (section)

===Legal proceedings===
Crumbley was arraigned by a magistrate on homicide and attempted homicide charges shortly after he was arrested, to allow for continued custody, but he was not immediately charged as an adult. On December 1, he was charged with terrorism causing death, first-degree murder, assault with intent to murder, and possession of a firearm during the commission of a felony, with the possibility of more charges being added as the investigation continues.

According to the Associated Press, this appeared to be the first time in U.S. history where a terrorism charge was filed in relation to a gunfire incident on school grounds. Crumbley was charged as an adult, and a judge entered a plea of not guilty on his behalf. He was ordered to be held without bond and relocated to the Oakland County Jail.<ref>[https://www.cnn.com/2021/12/01/us/michigan-deadly-shooting-terrorism-charge/index.html Here's why the suspected Michigan school shooter has been charged with terrorism], ''CNN''</ref>

After announcing the charges against Crumbley, prosecutor Karen McDonald told reporters that her office was also considering criminal charges against Crumbley's parents in connection to the shooting. McDonald said responsible gun ownership was crucial to stop tragedies and those who are not responsible should be held accountable.<ref>[https://www.seattletimes.com/nation-world/nation/explainer-how-unusual-to-charge-parents-in-school-shooting/ EXPLAINER: How unusual to charge parents in school shooting?], ''The Seattle Times''</ref>

A search warrant was also executed at Crumbley's home, where a cell phone, a journal, and other items were seized as part of the investigation around the shooting and Crumbley's prior social media posts. The cell phone contained two videos of Crumbley, both of which were filmed the night before the shooting, and in which he purportedly talked about shooting and killing students at the school the next day. The journal also reportedly detailed "his desire to shoot up the school".<ref>[https://www.wxyz.com/news/oxford-school-shooting/i-wonder-how-many-people-i-will-kill-inside-the-journal-and-the-mind-of-ethan-crumbley 'I wonder how many people I will kill': Inside the journal and mind of Ethan Crumbley], ''WXYZ''</ref>

On October 24, 2022, Crumbley pleaded guilty to all charges against him.<ref>[https://apnews.com/article/pontiac-michigan-oxford-high-school-shooting-crime-shootings-ff69e26f96bb07af5dcb76bddc650bb4 Michigan teen pleads guilty to killing 4 in school shooting], ''Associated Press''</ref>