CHOTEAU, Mont.  —  A state judge set a tentative trial date for the man accused of plotting to kidnap the toddler son of "Late Show" host David Letterman (search).

Kelly Frank (search) is scheduled to go on trial July 18 on charges of soliciting to kidnap, theft and obstruction. He has pleaded not guilty to all the charges.

Frank, a painter who had been hired to do work on Letterman's ranch in north-central Montana, was arrested in March after an acquaintance told investigators he had planned to kidnap the talk-show host's son, Harry Joseph, and the child's nanny and hold them for $5 million ransom.

On Tuesday, he entered an additional not guilty plea to a second charge of soliciting to kidnap — this charge involving the nanny.

Frank remains jailed on $650,000 bail.

Harry Joseph is the son of Letterman and his girlfriend, Regina Lasko. They were not at their Montana ranch at the time authorities said they uncovered the plot.