What was the cause of Thomas' death as noted in the memoir, All Boys Aren’t Blue: A Memoir-Manifesto?

Thomas is identified as the cousin with whom the author engaged in sexual activity that he, the author, identifies as assault. The author also describes how Thomas was killed in a fight after being called a "f*****." The author writes of coming to a place of empathy and compassion for Thomas, and then adds that any abuser should face the consequences of their actions.