ALFRED, Maine — Jeffrey Buchannan had been scheduled to appear in court Wednesday morning for a status conference in his prosecution for the alleged murder of Rhonda Pattelena, but the hearing was postponed. Buchannan's defense attorney, Jon C. Gale, asked the judge for a delay of at least 30 days because state authorities have not yet completed their examination of the defendant and issued their report, according to court documents. During an initial court appearance March 30, York County Superior Court Judge Wayne R. Douglas had ordered that Buchannan undergo a mental health evaluation and be held without bail. Douglas said he expects the matter will proceed to a grand jury.