Lou is a Chinese name. The shooter might be part Asian.
Found this on WhitePages.com for Patrick Crusius in Allen, TX:
https://www.whitepages.com/name/Patrick-Crusius/Allen-TX?l=Allen%2C+TX&q=Patrick+Crusius
Patrick Crusius
Age 21
Lives in Allen, TX
Used to live in
Related to Bryan Blake Crusius, Emily Megan Crusius, John Bryan Crusius