Lehigh County District Attorney Gavin Holihan announced the decision Wednesday after an investigation by Allentown Police Department and Lehigh County Homicide Task Force.
Xiaomin Fei, 34, on Thursday entered the plea in the June 3 shooting deaths of Robert and Gretchen Ackerman, Northampton County District Attorney Stephen G. Baratta announced.
Santos Mota-Ramirez, 61, pleaded guilty Wednesday to two counts of attempted homicide, aggravated assault with a deadly weapon, simple assault, arson and causing a catastrophe, District Attorney Gavin P. Holihan said.
Yunior Peralta-Quintana, 23, of Allentown, was convicted Friday by a Lehigh County Court jury after a four-day trial before Judge Anna-Kristie M. Marks.
Amazon driver Troy Johnson, 30, of Philadelphia, also was ordered to face court on a felony count of accidents involving death and misdemeanor counts of involuntary manslaughter and recklessly endangering another person.