INDIANAPOLIS (AP) _ A man already charged in a deadly house explosion in Indianapolis has pleaded not guilty to a charge he tried to arrange the killing of a key witness from jail.
 
  Marion County Judge Sheila Carlisle entered a not guilty plea on Mark Leonard’s behalf Wednesday. Prosecutors last week charged Leonard with conspiracy to commit murder, which carries a penalty of 20 to 50 years.
 
  Leonard, his girlfriend and his brother already faced life without parole if convicted in the Nov. 10 explosion that killed two people and damaged left 33 homes.
 
  Carlisle set a possible jury trial date in the murder-for-hire case for June 3.  Leonard’s public defender, Deana Martin, said the trial likely would be delayed.