Austin Stallman, the 21-year old son of Brazoria County Sheriff Bo Stallman, died Tuesday morning two weeks after he developed heatstroke, a spokesperson for the sheriff’s office confirmed.

Austin Stallman died just after 4 a.m. at a San Antonio hospital from complications from a heatstroke he suffered while trying out for a Navy SEALs program at Texas A&M, where he was a student, according to Brazoria County Sheriff’s Office PIO Sabrina Quintanilla.

His mother, Jeanna Stallman, also confirmed his death in a tribute to her son shared on Facebook.

“We did not get the miracle we wanted and our hearts are broken, but we know Austin is pain-free, fully restored, already getting the angels to laugh, and he will be waiting for us to join him someday,” she wrote.

“I am so blessed I got to be Austin’s mom,” she continued. “He brought me so, so much joy. In his short life as well as everyone else who met him.”