A man shot and killed during a SWAT standoff in Dallas this week has been identified as someone who previously worked security for U.S. Rep. Jasmine Crockett. Source: Aaron Schwartz / Getty According to CBS News Texas, the man killed during the confrontation has been identified as 39 year old Diamon Mazairre Robinson. Sources told the outlet Robinson had been publicly operating under the alias "Mike King" while running a business that placed law enforcement officers into off duty security jobs across North Texas.