The previous employer and his family men reportedly killed a working child as he took a job under another employer at a nearby area at Tutpara in Khulna City Corporation leaving the prior one. The incident took place on early Tuesday.The dead was identified as Md. Raqib Hawlader, 12, son of Nurul Alam Hawlader, a resident in Khulna city of the south-western Bangladesh.The Khulna Sadar Station police arrested Md. Sharif, owner of Sharif Motors, his bother Mintu and their mother Beauty Begum, said Sukumar Biswas, officer in-charge of the police station.Nurul Alam Hawlader, father of the victim child told journalists that the previous employer of Raqib killed the child by pushing air into his body with a compressor machine through the way people leave their waste.The victim was first taken to Khulna Medical College Hospital with unconscious condition and then shifted to Dhaka as the condition was going to be deteriorated. But he died on the way.A case was filed with the police station in this connection.