A former Milwaukee sheriff's deputy will spend 18 months behind bars for beating a man in the back of a squad car.The attack happened more than 4 months ago, after former deputy Scott Krause gave the handcuffed Ray Calderone a warning for kicking the window of the squad car.Calderone was asking to use the bathroom, and continued kicking the window. The tape then shows Krause yelling at Calderone and slapping and punching him in the head repeatedly.More than four months later, Calderone asked a judge to make an example out of his attacker."I haven't been the same psychologically or physically," Calderone said in court on Friday.Prosecutors admit Calderone was unruly that night, but said that was no excuse for losing control.Krause's attorney says his client suffers from PTSD after four years in the army, and has zero history of violence.The former deputy tearfully apologized to his victim, his family, to the community and co-workers."I'm also sorry to other law enforcement officers that may have gotten a bad name from what I did," Krause said.The judge recognized Krause's contrition and clean record, but sentenced him to a year and a half in prison, saying the shock from this abuse of power is too great to ignore.Calderone did not want to talk after court, but said through his attorney the sentence was fair.