The family of one of four people killed in a New York pharmacy holdup filed a $20 million lawsuit Thursday, alleging that a drug company that manufactures painkillers, a physician accused of improperly distributing the drugs, police officials and others were responsible for the victim’s death. Attorney John Ray filed the lawsuit on behalf of the daughters of Jaime Taccetta, a customer who was killed in the June shooting at Haven Drugs in the Long Island community of Medford. “They wish to ensure that everybody and anybody who did anything to harm their mother should be held liable and should have to pay,” Ray said at a news conference where he was joined by one of Taccetta’s daughters.