( CNN ) The Tulsa County reserve deputy who fatally shot a man instead of using his Taser turned himself in to authorities Tuesday at the Tulsa County Jail . Video shows Reserve Deputy Robert Bates announcing he is going to deploy his Taser after an undercover weapons sting on April 2 but then shooting Eric Courtney Harris in the back with a handgun . Bates was charged with second-degree manslaughter Monday . He surrendered Tuesday morning , accompanied by his attorney , Clark Brewster , and immediately posted bail of $ 25,000 . As he exited the jailhouse , Bates paused in front of television cameras for a moment but did not speak . His attorney reiterated that he believes the charge against his client is unwarranted . The Tulsa County Sheriff 's Office says a sting operation caught Harris illegally selling a gun . Harris ran when officers came in for the arrest . Authorities say Bates thought he pulled out his Taser but `` inadvertently '' fired his gun . Harris ' brother , Andre Harris , told CNN that he is pleased District Attorney Steve Kunzweiler pressed charges . In his opinion , however , no type of force should have been used in the arrest of his brother . Watching the video of the shooting , Andre Harris said he can see that three or more officers were already on top of his brother . That manpower should have been enough to arrest him , he said . `` It was a situation where I did n't necessarily think that a Taser should even be used , '' Andre Harris said . Scott Wood , another Bates ' attorney , has said the shooting was an `` excusable homicide . '' Investigators ' efforts to defend Bates and the other deputies involved in the arrest have sparked a mounting chorus of criticism online . Harris ' relatives are demanding an independent investigation of what they call unjustified brutality . They 're also questioning why the 73-year-old Bates -- the CEO of an insurance company who volunteers as a certified reserve deputy -- was on the scene in such a sensitive and high-risk sting operation . Daniel Smolen , an attorney representing the Harris family , said Bates paid big money to play a cop in his spare time . Bates , who was a police officer for a year in the 1960s , had been a reserve deputy since 2008 , with 300 hours of training and 1,100 hours of community policing experience , according to the sheriff 's office . He was also a frequent contributor to the Tulsa County Sheriff 's Office , including $ 2,500 to the re-election of Sheriff Stanley Glanz . The sheriff 's office has said that Bates had law enforcement certification , but Smolen said he has not seen any field training records . `` We 're holding up all right at this point , '' Andre Harris said . `` We 're putting our faith in God that justice will be served , and we can get some closure in this situation . '' How easy is it to confuse a gun for a Taser ? In a statement released Tuesday , Eric Harris ' family members said they know there are many good deputies working in Tulsa County . `` However , the treatment of Eric of April 2 clearly shows that there is a deep-seated problem within the TCSO , '' the statement said . The family said that the sheriff has not apologized and that the department has not shown remorse or indication it will change its policies . CNN 's Jason Morris and Ed Lavandera contributed to this report .
Reserve Deputy Robert Bates surrenders to authorities , posts bail of $ 25,000 . Bates is charged with second-degree manslaughter in the killing of Eric Harris .