( CNN ) -- Barely holding back his sobs , a 13-year-old boy makes a heart-rending 911 call to the Grove City Police Department in Ohio . `` My dad just killed my mom . He just told me to call you guys , '' the boy is heard telling a 911 dispatcher . `` He just ran outside and killed my mom . And she 's laying in the grass in front of the apartment . '' The boy 's father , Jeremy Roberts , had the boy make the call , police said , after allegedly stabbing his ex-wife to death outside his apartment . Despondent dads driven to kill loved ones . Roberts then calmly got on the phone himself , giving the apartment 's address and informing police that the `` only '' weapon -- a knife -- was outside with his ex-wife , Candice Roberts . `` What did you do ? '' the dispatcher asks him . `` She 's covered in a blanket . You guys will see , '' Roberts responds in an even tone . He can then be heard , on the nearly five-minute 911 call , telling his children that they have a `` good big sister ( who ) will take care of you guys . '' `` I told you that there 's a lot of things that you do n't understand , and you do n't know . And now there 's no choice for them to come out , '' Roberts said in the recorded call , without detailing what he meant . Before going to the front door -- and handing the phone back to his 13-year-old son -- Roberts says , `` One more hug . I love you guys . '' A small child can be heard crying in the background . The 13-year-old boy can be overheard telling his father , `` I do n't want to see you right now . '' Roberts , 38 , is in custody and will be charged with murder in connection with his ex-wife 's death , police said . The victim had gone to the suspect 's apartment in Grove City , about 10 miles southwest of Columbus , before 9 a.m. Sunday to pick up their two children , police said . Afterward , the 13-year-old boy phoned police to tell them his mother was dead and his father was responsible . Candice Roberts ' 16-year-old daughter told CNN affiliate WCMH she feels `` incomplete and abandoned '' after the death of her mother , who she said `` was always there for me . '' Her brother is haunted by what he saw , she said . `` My brother says that every time he opens his eyes , he sees my mother 's face and her yelling , 'Help me ! ' `` the teenager said . `` And he sees my dad standing there with the blood all over him , and the knife in his hand . '' The daughter added that she `` would do everything for him to be held accountable . '' `` You do n't just get to murder somebody and get away with it , '' she said . 'My own dad tried to kill me ' : Faith , friends help in survival .
Jeremy Roberts , 38 , will be charged with murder in his ex - wife 's death , police say . ` ` He just ran outside and stabbed my wife , '' Roberts ' year - old son told a 911 dispatcher . Roberts got on the phone , calmly told police he had stabbed his ex - wife . The son who called 911 is haunted by what he saw , his older sister said .