The second in command at the sheriff's department where reserve deputy accidentally killed a man because he fired his gun instead of a Taser has resigned. Undersheriff Tim Albin, of the Tulsa County Sheriff's Office in Oklahoma, quit his job Monday after new revelations about how the department treated elderly killer Robert Bates, 73. Bates, who was a volunteer deputy, shot dead Eric Harris, 44, after he was tackled to the ground. Video of the killing shows Bates exclaiming that he opened fired by accident, and apologizing. Resignation: Undersheriff Tim Albin (pictured), of the Tulsa County Sheriff's Office in Oklahoma, quit his job Monday after new revelations about how the department treated elderly killer, reserve deputy Robert Bates . In the tide of scrutiny which followed the incident, it emerged that other deputies in the department had expressed concern about his fitness to serve, but were told to hold their tongues. Bates, a millionaire insurance broker, had made substantial donations to the department in previous years. He has been charged with manslaughter - but a judge allowed him to take a month-long holiday to the Bahamas before his day in court. Sheriff Stanley Glanz didn't specify why Undersheriff Tim Albin stepped down, but said departmental reorganization was necessary following the April 2 shooting. Charged: Bates, 73, (left) accidentally grabbed his pistol and killed Eric Harris (right, in a previous mug shot) in what he said was an accident . 'Given the gravity of the current situation and the need to go a different direction with our leadership and management he agrees with me that it is time for a change,' Glanz wrote in a news release. Albin, who has been in his position for 26 years, has yet to comment on his departure, which will take effect and the end of this week. Albin was named in a 2009 internal investigation released Friday that showed deputies had expressed concerns about Bates' performance. Some claimed Albin gave Bates preferential treatment and intimidated those who raised concerns. The former head of the reserve deputy program, Sergeant Randy Chapman, told the investigator that Albin chastised him after he questioned Bates' performance. Confusion: An image shows a Taser and a handgun similar to the weapons Bates was carrying. He mistakenly thought he was holding a Taser, not his handgun, when he fatally shot Eric Harris . 'You need to stop messing with (Bates) because he does a lot of good for the County,' Chapman is quoted in the memo saying Albin told him that. Chapman declined to talk about the memo when contacted last week by The Associated Press and also declined Monday after Albin's resignation. 'I've been told to stay out of it,' he said. According to the report, Chapman complained to Albin on one occasion that Bates was driving a personal car with police equipment prior to having the requisite training, Albin told him: 'This is a s--- sandwich and you will just have to eat it but not acquire a taste for it.' A little more than five years later, 44-year-old Eric Harris was shot while on the ground in custody after running from deputies following a sting operation. The 73-year-old Bates has pleaded not guilty to a charge of second-degree manslaughter. Bates is white and Harris was black, but the victim's brother has said he doesn't believe the shooting was racially motivated. Attorneys for Harris' family have repeatedly called on Glanz and Albin to resign.
Tim Albin of the Tulsa County Sheriff's Office quit his job on Monday . Follows killing of suspect Eric Harris, 44, by reserve deputy Robert Bates . Bates claims he shot Harris by accident and meant to use his Taser .