David Wenwei Chou () was born in 1953 in Taiwan as a second-generation
waishengren and raised in a
military dependents' village as his father was in the military. He graduated from the
Taichung First Senior High School in 1971 and completed a master's degree in the U.S. during the 1990s, after which he worked as a translator. Chou considers himself and Taiwanese as "all Chinese"
of a single country without a border. In the past, immigration documents from Taiwan often showed China as the place of birth. This might have led law enforcement and some media outlets to misidentify Chou as an immigrant from the mainland. According to his former neighbor, Chou moved to Las Vegas in 2009 and once owned an apartment building. In 2012, he suffered a nearly fatal attack from two tenants over rent that led to a loss of consciousness, a broken skull, elbow, and partial hearing loss. He also suspected that the police detectives tried to withhold a bag with his money before the prosecutor allowed it to be finally returned. The incident is said to have changed his temperament and view of law enforcement negatively. Acquaintances who knew Chou and his wife through the Taiwanese Association of Las Vegas and the local Taiwanese Presbyterian Church were surprised by his pro-
unification stance, because most members there were pro-independence. They recalled Chou was very negative about life and complained about unfairness in society, about Taiwan and U.S. government and law enforcement. In 2019, Chou attended the founding ceremony of Las Vegas Chinese for Peaceful Unification and displayed a banner calling for the "eradication of pro independence demons". During their divorce in 2021, his wife returned to Taiwan, where their son lives, for late stage cancer treatment. Other tenants have found photographs of Chou posing with a gun and laughing hysterically at a memorial for the
2017 Las Vegas shooting. He had allegedly written a manifesto entitled
Diary of the Independence-Slaying Angel () and mailed it to the
pan-blue World Journal. The package arrived one day after the shooting and is in the possession of the newspaper's attorney pending subpoena. == Investigation and legal proceedings ==