Q1: I read some information on the web that isn't in this article!
A1: When proposing anything to be added to the article you need to cite a reliable source; secondary sources are generally preferred over primary.
Q2: Why is Wright described as "Black", "African American", and "Biracial"?
A2: Many reliable sources and the government documents publicly available refer to him as "Black" or "African American". Some reliable sources describe Wright as a "biracial" Black man.
Q3: Why is this article calling it a killing instead of a death/murder?
A3: Any time one person causes the death of another – whether intentionally or not, whether criminally or not – that's a homicide, or in common American English parlance, a killing. Every murder or manslaughter is a homicide, but not every homicide is a murder or manslaughter. A homicide becomes, legally, a murder or manslaughter only once someone is convicted in court.