The girlfriend of Markeis McGlockton, 28, who was shot dead outside a convenience store near Clearwater on Thursday by a man he pushed to the ground, has retained well-known civil rights attorney Ben Crump, the lawyer confirmed.PREVIOUS COVERAGE: No arrest in fatal shooting during argument over handicap parking space. Crump is known for representing the family of Trayvon Martin, a teen who was fatally shot in 2012 by George Zimmerman, a neighborhood watch captain, in Sanford. That case generated international headlines and is one of the most famous instances of a shooter claiming protection under Florida’s "stand your ground" law, which gives immunity to those who use force to defend themselves if they fear for their lives.Last week’s shooting also has invoked the "stand your ground" law. The man who authorities say shot McGlockton, Michael Drejka, 47, has not been arrested. Pinellas County Sheriff Bob Gualtieri has said the law renders Drejka’s actions legal.Gualtieri said Drejka confronted McGlockton’s girlfriend, Britany Jacobs, in a convenience store parking lot for parking in a handicapped parking space. Video of the confrontation shows McGlockton emerging from the store and shoving Drejka to the ground. It then shows Drejka shooting McGlockton.McGlockton’s family disagrees with Gualtieri’s decision. They have implored State Attorney Bernie McCabe to file charges against Drejka.Crump plans to hold a Thursday morning news conference at the Pinellas County Justice Center to "demand an amendment to discriminatory Stand Your Ground laws and justice for Markeis McGlockton," according to a news release from his law firm.