Police detained a 35-year-old man over charges of molesting and killing a three-year-old girl in Ashulia, Savar on Tuesday.
The detainee was identified as Sayeem, from Mymensingh.
The victim’s family sources alleged that the perpetrator molested the toddler while she was playing with her friends at Rupayan playground in Ashulia's Jamgora.
The girl was found unconscious on the ground later on and rushed to a local hospital where on-duty doctors declared her dead.
Abdul Awal, officer-in-charge of Ashulia police station, said police are primarily suspecting that Sayeem killed the girl after molestation.
The body was sent to Dhaka Medical College and Hospital morgue for autopsy.