“We’ve had to listen to that defense team talk down your son quite a bit now. No more,” the newspaper quoted Fred Schaub, an assistant state attorney, as telling the family in a hallway outside of the courtroom. Prosecutors did not respond to requests for comment on Saturday.

What happened in the parking lot?

On July 19, 2018, Mr. McGlockton, 28, was in the convenience store with his 5-year-old son while his girlfriend, Britany Jacobs, and two small children were sitting in a car parked in a handicapped space. Mr. Drejka, 49 , approached the car and started arguing with Ms. Jacobs about parking in the space without a handicap permit, according to the sheriff.

In grainy surveillance footage of the scene, Mr. McGlockton leaves the store, approaches Mr. Drejka and shoves him to the ground. Mr. McGlockton then appears to take a few steps back from Mr. Drejka, who pulls out a gun while sitting on the pavement and shoots Mr. McGlockton once in the chest.

Mr. McGlockton was seen stumbling back into the store, clutching his wound. He collapsed next to his son and was taken to a hospital, where he was pronounced dead.

Mr. Trevena said he would argue, in his appeal, that the jury should not have been allowed to view surveillance video in slow motion given the importance that the quick pace of events had on the defense team’s argument. The lawyers also plan to argue that the Pinellas County sheriff, himself a former lawyer, should have been allowed to testify about why he declined to charge Mr. Drejka.

What is the Stand Your Ground law?

Originally passed in 2005, the law allows people to use deadly force without first trying to retreat from a dangerous situation if they “reasonably believe” that their lives are threatened. The law received support from the National Rifle Association but was vigorously opposed by law enforcement officers.