    lSentence 1: Helen Sharkey , 31, and Gene Foster , 44.,  lpleaded-guilty Tuesday-to one count of-conspiracy to  ommit securities fraud.    |Sentencé 2: The two athers, former Dynegy executives|  lHelen .Christiné Sharkey.,-31 , and Gene ‘Shannon  lFdster , 44 , pleaded guilty:Tuesday to. one, count of|  conspiracy tocommitsecuritiesfrauid.         