Final answer:
The Atlanta Child Murders lasted from July 1979 to June 1981, with the arrest of Wayne Williams. At least 28 individuals were killed during this period, and while Williams was convicted of two adult murders, he is suspected to be involved in many of the child killings.
Step-by-step explanation:
The Atlanta Child Murders took place over a period of approximately two years. It started with the disappearance of two children in July 1979 and ended with the arrest of Wayne Williams in June 1981. Over this period, at least 28 children, adolescents, and adults were killed. Williams was tried and convicted for two of the adult murders and is believed by law enforcement to be responsible for many of the child killings, although he has not been formally charged in those cases.