GREAT NECK - Federal agents are investigating a Great Neck doctor accused of prescribing pills to the couple sentenced in the Medford pharmacy shooting. Police say Dr. Eric Jacobsen admitted writing prescriptions for both David Laffer and his wife before Laffer opened fire in Haven Drugs last Father's Day. According to Newsday, investigators are looking into the alleged overdose deaths of two of his patients. Agents raided Jacobsen's office last month.Laffer, wife get max sentences for roles in Medford massacre