The superintendent of a charter school for the deaf in Arlington is leaving. It's not clear whether Kathi Johnson was fired from the Jean Massieu Academy or is leaving on her own because the board is refusing to explain the reason for the change. Johnson came to the school in 2008 and was in charge when the Texas Education Agency decided to shut the school down because of substandard academic and financial problems. The state ended up giving the school a year probation and credited Johnson with making improvements.