Kyler Murray is stepping up in a big way ... the Arizona Cardinals star just donated thousands of dollars to William Cho, the 6-year-old boy who lost his loved ones in the Texas mass shooting earlier this month.
Cho had visited the Allen outlet mall on May 6 with his family ... when a gunman opened fire -- and killed his mom, dad and brother. Cho suffered injuries in the horrific rampage, but after spending time in the ICU, he's recovering well.
Friends of the Cho family set up a GoFundMe page with the hopes that it would provide the little boy with enough money to help him in the wake of the tragedy once he heals up .