    Sentence % Helen Sharkey , 31 ,\and'Gene  Foster.;, 44.,-pleaded -guilty: Tuesday: to  one: count of: conspiracy:.to=: commit         Sentence 2: The * two’ others former.  Dynegy’ - executives Helen’: -Christine  Sharkey’;'31 j.and.Gené Shannon Foster,  44"; pleaded guilty Tuesday: to one.count  ‘of: conspiracy to commit securities fraud.    