A Montgomery County lawyer accused of killing a Bucks County deer hunter in late November is heading for trial. 49-year-old David Manilla of Worcester waived his right to a preliminary hearing Monday in Bucks County Magisterial District Court.  He is charged with involuntary manslaughter and other criminal offenses, including gun and hunting law violations.  Court documents say Manilla admitted firing a high-powered rifle, shooting and killing 52-year-old Barry Groh of Quakertown as the victim dragged a deer along the Tohickon Creek in Richland Township on opening day of the firearms deer season.  Hunting with a high-powered rifle is illegal in Bucks County because of the population density.  Manilla also faces a wrongful death lawsuit filed by the Groh Family.  Among other things, it says he illegally tried to hide assets because he knew he would be sued.  He is due back in court on Friday to make a full accounting of how he spent nearly $200,000 from the sale of a home.  A judge has barred him from taking money from his bank accounts except for paying legal fees.