( CNN ) The police chief in an upscale community outside Atlanta said he was sleeping when he moved a gun in the bed and accidentally shot his wife in the back , according to a 911 tape released Friday . `` Who shot her ? '' the 911 operator asked William McCollom , the police chief in Peachtree City , Georgia . `` Me , '' McCollom replied . `` How did you shoot her ? '' `` The gun was in the bed , I went to move it , put it to the side , and it went off , '' McCollom said . `` Is she awake ? '' `` No , everybody was sleeping , '' McCollom said . `` No , is she awake now ? '' `` Yes , '' he said . Later in the call , the operator asked McCollom , `` Were you asleep also when this happened ? '' `` Yes , '' he said . Wife in critical condition . Margaret McCollom , 58 , was listed in critical condition Friday at Atlanta Medical Center , according to the hospital . William McCollom , 57 , has not been charged with a crime , but he has been put on administrative leave while the shooting is investigated by the Georgia Bureau of Investigation . McCollom started out the 911 call by describing the problem : `` Gunshot wound , accidental , need medical ASAP . '' He made the call to 911 about 4 a.m. Thursday . He did n't mention he was the top law enforcement officer in the town of 35,000 people until the 1:50 mark in the six-minute recording . The 911 operator asked where the gun was located . At first McCollom said he did n't know , then said , `` I 'm the chief of police . The gun is on the dresser . '' `` You 're the chief of police in Peachtree City ? '' the operator asked . `` Yeah , unfortunately , yes , '' McCollom said . 'Come on , guys , get here ' In a statement released Friday , the GBI said : `` Chief McCollom has been cooperating with GBI agents working the investigation . Ms. McCollom will be interviewed when her medical condition improves . When the GBI completes the investigation , it will be turned over to Fayette County District Attorney Scott Ballard . '' At one point in the recording , the operator asked , `` Is that her crying ? '' A woman 's moans can be heard in the background . `` Yes , she 's having trouble breathing , '' McCollom said . At another point , McCollom addresses his wife , `` Are you having trouble breathing , dear ? '' `` Come on , guys , get here , '' he says while waiting for the police and ambulance . `` Oh my god , how did this happen ? '' When the police arrive , McCollom can be heard telling them the gun is on the dresser . The 911 operator ended the call . Authorities are n't revealing many details , but said in a Thursday press conference that McCollom shot his wife with his service Glock 9mm . McCollom told the 911 operator he had shot his wife twice , but the GBI said investigators determined she 'd only been shot once . Peachtree City known for golf carts . McCollom was named the police chief in October after being interim chief for three months , reported CNN affiliate WSB . Peachtree City posted this statement on the city website : . `` City Manager Jim Pennington said , 'This morning , I met with every department manager , and the city of Peachtree City , including the Peachtree City Police Department , is continuing with normal operations . ' Peachtree City Mayor Vanessa Fleisch said , 'Our thoughts and prayers are with Maggie and the McCollom family right now , as we wait for the state investigation to proceed . ' `` Magazines and websites regularly rank Peachtree City as one of the best places to live and raise a family . The community 's trademark : Residents putter around in golf carts on the community 's 90-plus miles of paved pathways .
911 tape : `` The gun was in the bed of my truck No charges filed while case is being investigated .