As Venkataraman was a witness in his brother’s murder case, he received calls threatening him. Rajesh and his relative Dinesh were cited as accused in Venkataraman murder case, said the police. In connection with the murder case before Tiruvallur court, five witnesses were asked to appear on Tuesday to give their statement. “As the witnesses were waiting in the corridor, one of them spotted the college students,” said a police officer. Tiruvallur police have registered a case against the students for carrying weapons and under section 195 A of IPC..