Nalgonda: A 36-year-old police constable was killed and his wife and two children were injured when their car overturned on the Greenfield Highway at Ramanujavaram in Thallada mandal of Khammam district while the family was returning to Hyderabad after visiting a temple in Annavaram, police said on Saturday. The deceased was identified as Swarnakanti Jaswanth, a 2021-batch constable posted at Bolarum police station in Hyderabad. His wife Mounika, son Kalyan Ram, 4, and daughter Manya, 6, sustained injuries in the accident.