A three-year-old girl found dead in a field in Uttar Pradesh's Lakhimpur Kheri on Thursday morning was raped and strangled, the police said today. This is the third rape-murder of a minor in the district in 20 days. The girl had been missing since Wednesday. Her body was found just half a kilometre from her home with injuries. A man from her village, Lekhram, has been arrested based on her father's complaint.