Wu Sansi
Later in spring 706, with all five of the coup leaders already out of the capital, Wu Sansi and Empress Wei made accusations against them, and they were demoted to more remote prefectures—in Huan's case, to be the prefect of Bo Prefecture (亳州, roughly modern Bozhou, Anhui). Wu Sansi then had his strategist Zheng Yin further accuse the five of them of having participated in the plot of Emperor Zhongzong's son-in-law Wang Tongjiao (王同皎)—who was executed early in 706 after having been accused of plotting to kill Wu Sansi and deposing Empress Wei. The five were further demoted with the provisions that they would never be allowed to return to the capital Chang'an, with Huan becoming the military advisor to the prefect of Long Prefecture (瀧州, roughly modern Yunfu, Guangdong) and stripped of his surname of Wei. Wu Sansi then had accusations that Empress Wei was having affairs posted publicly in Luoyang, with the intent of incensing Emperor Zhongzong—and then accused the five coup leaders of being behind this public humiliation. He then had his associates propose that the five be killed. Emperor Zhongzong, citing that the five had been previously awarded iron certificates that guaranteed that they would not be executed in recognition of their contribution, ordered that they be reduced to commoner rank and permanently exiled to the Lingnan region with their families—in Huan's case, to Rang Prefecture (瀼州, roughly modern Chongzuo, Guangxi). At the suggestion of Cui Shi, Wu Sansi then sent the censor Zhou Lizhen (周利貞) to the Lingnan region under guise of reviewing the affairs of the region but with instructions to kill the five. When Zhou encountered Huan at Gui Prefecture (貴州, roughly modern Guigang, Guangxi), he had Huan bound and then slid over sharpened bamboo roots, tearing Huan's flesh off until bones were showing; he then caned Huan to death. After Emperor Zhongzong's death in 710 and Emperor Zhongzong's brother Li Dan the Prince of Xiang, himself a former emperor, was restored (as Emperor Ruizong), Huan and his colleagues were posthumously honored.