Police have detained several suspects, including the elderly woman’s stepson, as they investigate a land dispute and the possibility of sexual assault. A 41-year-old man has been arrested for allegedly killing his 70-year-old mother on suspicion that she practiced witchcraft. According to police, the attack took place on October 28, when the. RANCHI: A 70-year-old woman was allegedly stabbed to death by her son on suspicion of practising witchcraft.