Seau's death recalled the 2011 suicide of former NFL player Dave Duerson, who shot himself in the chest and left a suicide note requesting that his brain be studied for brain trauma. Seau had no prior reported history of concussions, but his ex-wife said he did sustain concussions during his career. "He always bounced back and kept on playing," Gina Seau said. "He's a warrior. That didn't stop him." Seau had insomnia for at least the last seven years of his life, and he was taking zolpidem (Ambien), a prescription drug commonly prescribed for sleep disorders.