The video, a copy of which was obtained in recent days by The New York Times, is similar to recordings of fatal encounters involving law enforcement officers in Chicago; North Charleston, S.C.; and Staten Island. Each one depicts in stark terms a response from officers that resulted in a death. In this instance, there are no racial overtones: Both Mr. Sherman and the deputy sheriffs are white.

The footage from Georgia was released Friday by prosecutors in Coweta County in response to requests from the family and the news media. It shows the sheriff’s deputies struggling to subdue Mr. Sherman as he tried to get out of the car, stunning him repeatedly with their Taser guns while he was handcuffed, and reacting frantically after realizing he was dead.

Mr. Sherman’s death was a homicide due to “an altercation with law enforcement with several trigger pulls of an electronic control device,” according to his death certificate, which said that he had been shoved to the floor of the car and that his torso was compressed “by the body weight of another individual.”

“How can they do this when they know someone is having a breakdown?” said L. Chris Stewart, a lawyer for the Sherman family. “Once they started shocking him, how can someone comply when they’re being electrocuted over and over again?”

Kevin and Mary Ann Sherman, Chase Sherman’s parents, said they were not sure what had caused their son’s odd behavior. They said they first became concerned when he began acting erratically while they were in the Dominican Republic for the wedding. Chase told his mother that he had taken the synthetic marijuana the day before they traveled there.