A 57-year-old woman in Prakasam district, frustrated with her son’s misconduct, allegedly killed him and with the assistance of relatives and dismembered his body into five pieces, police said on Saturday.Prakasam Superintendent of Police, A R Damodar said K Lakshmi Devi (57) allegedly murdered her son, K Shyam Prasad (35), a cleaner, on February 13.Devi’s relatives allegedly helped her in killing Prasad.”Unable to bear her son’s perverted and indecent behaviour, she (Lakshmi Devi) killed him,” Damodar told PTI, adding that Prasad had also behaved indecently with his aunts and other relatives in Bengaluru, Khammam, and Hyderabad.Prasad, who was unmarried, had also allegedly attempted to rape his maternal aunts in Hyderabad and Narasaraopeta, police said.