How did Xiao Hammer, the provincial judge of Daming, die?

Being held in Zhao prison. Xiao Hammer and Xueyan want to save, and under the leadership of Xueyan (security guard), they sneak into Zhao prison. Xiao hammer let go, and he took his place. After Zhou Xin left, Duan Wuji didn't know that we sent someone to blow poison gas with a bamboo tube to kill Zhou Xin. As a result, it was a small hammer that was poisoned and suffocated.