Prasad (38), attached to the Kerala State Electricity Board of Panavilayil House in Konni, was killed while two other workers Shiju and Mohankumar, were injured. The tempo in which they were travelling fell into a wayside ditch at Puthenpeedika near here on Saturday. According to police, Mohankumar has been admitted to the Thiruvananthapuram Medical College Hosptial and Shiju is undergoing treatment at the Pathanamthitta General Hospital.