( CNN ) -- A 43-year-old Missouri man told police that he suffocated his 3-year-old neighbor with a plastic bag , then stuffed her body in the same bag and tossed her from a highway , according to a court document . Shawn Morgan of Senath has been charged with first-degree murder in the death of Breeann Rodriguez . The girl was last seen on August 6 , riding her pink bicycle with her brother outside their home in Senath . While authorities have found her bike , authorities continued to search Monday for her body , Dunklin County Prosecuting Attorney Stephen Sokoloff said . Sokoloff added -- and the Dunklin County court clerk 's office confirmed -- that Morgan does not yet have an attorney . His legal representation could be settled when he is arraigned in a Kennett , Missouri , court at 9 a.m. Tuesday , the prosecuting attorney said . According to a probable cause affidavit dated Saturday , police interviewed Morgan on Friday at the police department in Kennett , a larger community about 10 miles northeast of Senath . The suspect said that he spotted the girl standing on a ladder by the pool in his backyard , in Breeann 's neighborhood . He told police that he grabbed the girl and carried her inside his house . There , according to the affidavit , the man `` suffocated the girl with a white plastic trash bag , by holding it over her face and mouth . `` Morgan states that he felt like it took an hour for the girl to die , '' the document adds . It says Morgan told police he put the girl 's body into the same trash bag , and then drove to Missouri 's Highway 164 and got rid of the body by throwing it over a railing into a floodway ditch . After returning home , Morgan said , he then dismantled the girl 's bike and dumped it into another , related waterway , the document says . A bicycle was recovered there and identified by Edgar Rodriguez as belonging to Breeann , his daughter . Police said Thursday that they had found two training wheels similar to those on the girl 's bike . In addition to murder , Sokoloff said in a statement Saturday that Morgan is charged with armed criminal action and tampering with physical evidence . The suspect , who Sokoloff said had three children of his own , is being held at the Dunklin County Justice Center . The FBI , which earlier had a major role in the case , has passed off control of the investigation to local authorities following Morgan 's arrest , FBI spokeswoman Rebecca Wu said . Meanwhile , the approximately 1,800 residents of Senath -- a city in southeast Missouri 's `` boot heel , '' about 90 miles north of Memphis , Tennessee -- are trying to come to grips with what happened . Sharon Haddock , who raised two children on the same street as both the victim and her alleged killer , said Monday that she knew Morgan as `` a little boy '' and knew some of his family members as `` very nice people . '' `` It 's just beyond belief that anybody ... could have done this , but now anybody on your street , '' she told HLN 's Vinnie Politan . `` You think you know your neighbors , but you do n't know them as well as you think you do . I would have never dreamed this in a million years . '' Another neighbor , Estelle Floyd , said she had lived 89 of her 90 years always feeling safe . But that sense of security has been shaken -- and she 's still trying to make sense of what happened . `` All these neighbors ... they 'd do anything for anybody at any time , '' Floyd told HLN . `` This was such a shock ... It has touched the hearts of everybody in this town . '' CNN 's Greg Botelho contributed to this report .
NEW : A neighbor says , `` I would have never dreamed this in a million years '' The suspect , who does n't have a lawyer , will be in court Tuesday , an official says . Shawn Morgan is charged with first-degree murder in a 3-year-old girl 's death . Police are searching for the man accused of killing his wife and her two young children before turning the gun on himself.