His father is also Matthew.
The FBI identified the shooter as a 20-year-old from Bethel Park, Pennsylvania. His employer says he passed a background check for his job.
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Crooks' home address is listed in Bethel Park, a suburb in the Pittsburgh metropolitan area, voter records show. That three-bedroom brick house has been owned since 1998 by Matthew and Mary Crooks, who appear to be his parents. Telephone calls to the couple were not returned overnight.
A Thomas Crooks graduated two years ago from Bethel Park High School, according to an online video of the ceremony, and was included in a 2022 local news article about recipients of a National Math & Science Initiative Star Award at the public high school, which enrolls about 1,300 students