A Manhattan hooker from hell who killed three johns when she fed them fentanyl to rob them — leaving one victim dead with his pants at his knees — pleaded guilty Tuesday and now faces up to life behind bars. Tabitha Bundrick, 39, copped to the “calculated” killings of the three men, who she robbed of anything she could get her hands on before fleeing across Upper Manhattan. Bundrick will be sentenced to 27 years to life in prison after copping to three murder charges and a separate charge for drugging another person who survived the attack, according to Manhattan...