VIZIANAGARAM:Vexed over the routine assault on his mother, a youth clubbed his step-father to death at Ramabhadrapuram in Vizianagaram district late Saturday night. The deceased has been identified as K Apparao (60), a daily wager. G Ramu, the accused fled the spot and is still at large. According to Ramabhadrapuram sub-inspector K Santosh Kumar, Apparao used to harass his wife and Ramu over petty issues. Apparao used to come home drunk and beat his wife. On Saturday at around 10.30 pm, Apparao came home drunk and started beating his wife. Ramu tried to stop his fatherm which ended in an altercation. Unable to bear the abuse Ramu hit his father on the head with a wooden log. Apparao died while being shifted to a hospital by his wife and family members. A case has been registered and investigation is on. Teams have been formed to nab the accused.