A 15-year-old girl was tortured to death by her cousin sister and her husband in Bahadurgarh area of Ghaziabad, police said Thursday.

The Superintendent of Police (Rural), Capt. M.M. Baig said a woman named Kavita Tomar had given birth to a son about six months back. In order to look after her child, Kavita called her cousin sister Shweta (name changed) from her house in Sikandrabad.