ngry over the delay in serving the food, a youth killed his mother with a cricket bat and injured his sister here, police said on Thursday. The incident occurred in Nandinagar in Banjara Hills on Monday but came to light on Thursday after N. Sakkubai (55) succumbed to her injures in a hospital. According to the police, N. Gopi returned home late on Monday night in an inebriated condition. After serving him the food, Sakkubai, who works as a domestic help, went asleep. He tried to wake her up for more rice. His sister Rani served him the rice. When he wanted rice for the third time, Rani asked him to go to kitchen and take it.