Police said the incident occurred on Wednesday in interior Tharoijam Maning Leikai area when the girl was sent by her aunt to deliver tea to her mother who was working at a nearby paddy field.
On the way, the girl was intercepted by her neighbour identified as Chingangbam Samjai (24) who allegedly raped her before strangulating her, police said.
When the girl did not return from the field, her family started a hunt. Local residents rushed to their aid and when the youths of the village were questioned, the needle of suspicion pointed to Samjai, police said.
The villagers lodged an FIR against Samjai at the local police station yesterday.
Police said they were investigating the matter.