Killing another person is humanity's greatest taboo. Mary Ann Sieghart continues her series of conversations with those who've been responsible for taking another life. Andrew knocked down and killed a young mother in a road traffic accident in 1989. He was given eighteen months despite the victim's family asking for a non custodial sentence. These events have always haunted him and they've shaped the rest of his life. He now works with young male drivers teaching them about speed awareness and safe driving. Producer: Lucy Lunt.