Mourners grieve at a memorial at Oxford High School in Oxford, Mich., Wednesday, Dec. 1, 2021. Authorities say a 15-year-old sophomore opened fire at Oxford High School, killing four students and wounding seven other people on Tuesday. (AP Photo/Paul Sancya)

Mourners grieve at Oxford High School in Oxford, Mich., Wednesday, Dec. 1, 2021. Authorities say a 15-year-old sophomore opened fire at Oxford High School, killing four students and wounding seven other people on Tuesday. (AP Photo/Paul Sancya)

Authorities say a 15-year-old sophomore opened fire at his Michigan high school, killing three students and wounding six other people, including a teacher.

Gov. Gretchen Whitmer embraces Oakland County Executive Dave Coulter as the two leave flowers and pay their respects Thursday morning, Dec. 2, 2021 at Oxford High School in Oxford, Mich. A 15-year-old boy has been denied bail and moved to jail after being charged in the Michigan school shooting that killed four students and injured others.(Jake May/The Flint Journal via AP)

Freshmen Rory Metzger, left, and Zachary Majewski place bows on trees outside Oxford High School in Oxford, Mich., Wednesday, Dec. 1, 2021. Authorities say a 15-year-old sophomore opened fire at Oxford High School, killing four students and wounding seven other people on Tuesday. (AP Photo/Paul Sancya)

A football is left in honor of Tate Myre, one of the four victims who was killed in Tuesday's school shooting, at a memorial where family, friends, students and relatives of victims put up bouquets of flowers, candles and personalized messages near an entrance to the Oxford High School on Thursday, Dec. 2, 2021 in Oxford, Mich. A 15-year-old boy has been denied bail and moved to jail after being charged in the Michigan school shooting that killed four students and injured others.(Jake May/The Flint Journal via AP)

Gov. Gretchen Whitmer embraces Oakland County Executive Dave Coulter as the two leave flowers and pay their respects Thursday morning, Dec. 2, 2021 at Oxford High School in Oxford, Mich. A 15-year-old boy has been denied bail and moved to jail after being charged in the Michigan school shooting that killed four students and injured others.(Jake May/The Flint Journal via AP)

Students hug at a memorial at Oxford High School in Oxford, Mich., Wednesday, Dec. 1, 2021. Authorities say a 15-year-old sophomore opened fire at Oxford High School, killing four students and wounding seven other people on Tuesday. (AP Photo/Paul Sancya)

Wreaths with black bows are shown at Oxford High School in Oxford, Mich., Wednesday, Dec. 1, 2021. Authorities say a 15-year-old sophomore opened fire at Oxford High School, killing four students and wounding seven other people on Tuesday. (AP Photo/Paul Sancya)

Waterford resident Andrew Baldwin, cousin of Madisyn Baldwin, places candles at the base of a a memorial with his 5-year-old daughter Ariyah Baldwin on Wednesday, Dec. 1, 2021 outside of Oxford High School in Oxford, Mich. Madisyn Baldwin, 17, was one of four teens killed in Tuesday's school shooting. A 15-year-old sophomore opened fire at his Michigan high school on Tuesday, killing four students, including a 16-year-old boy who died in a deputy’s patrol car on the way to a hospital, authorities said. (Jake May/The Flint Journal via AP)

Photos of three of the four teens killed in the Oxford High School shooting are posted on the window at Sullivan's Public House Restaurant and Bar on Thursday, Dec. 2, 2021 in Oxford, Mich. A 15-year-old sophomore opened fire at his Michigan high school on Tuesday, killing four students, including a 16-year-old boy who died in a deputy’s patrol car on the way to a hospital, authorities said. (Jake May/The Flint Journal via AP)