Interesting there have been many other “knockouts” but no federal charges.
Check this out:

The Department of Justice has charged a Katy, Texas man who participated in the “knockout game” with a federal hate crime.

On Thursday, federal officials announced that they arrested and charged 27-year-old Conrad Alvin Barrett — a white man — with a federal racially-motivated hate crime for attempting to knock out an unsuspecting 79-year-old African American man with a single punch.

“Suspected crimes of this nature will simply not be tolerated,” said U.S. Attorney Kenneth Magidson in a statement. “Evidence of hate crimes will be vigorously investigated and prosecuted with the assistance of all our partners to the fullest extent of the law.”