Haploidentical Donor Natural Killer Cell Infusion With IL-15 in Acute Myelogenous Leukemia (AML)

Inclusion Criteria: * ≥ 18 years of age * Meets one of the following disease criteria: * Primary acute myelogenous leukemia (AML) induction failure: no complete response (CR )after 2 or more induction attempts * Relapsed AML or Secondary AML (from MDS or treatment-related): not in CR after 1 or more cycles of standard induction therapy. For patients \> 60 years of age the 1 cycle of standard chemotherapy is not required if either of the following is met: * relapse within 6 months of last chemotherapy * blast count \<30% within 10 days of starting protocol * AML relapsed \> 2 months after transplant who do not have the option of donor lymphocyte infusions (e.g. recipients of autologous or umbilical cord blood \[UCB\] transplants) Patients with prior central nervous system (CNS) involvement are eligible provided that it has been treated and cerebrospinal fluid (CSF) is clear for at least 2 weeks prior to enrollment. CNS therapy (chemotherapy or radiation) should continue as medically indicated during the study treatment. * Available related HLA-haploidentical donor (3-5 of 6 HLA-A, B and C) * Karnofsky Performance Status \> 50% * Adequate organ function defined as: * Creatinine: ≤ 2.0 mg/dL * Hepatic: Liver function tests (LFT's) \< 5 times upper limit of institutional normal (ULN) * Pulmonary Function: oxygen saturation ≥ 90% on room air and pulmonary function \>50% corrected DLCO and FEV1 Testing required only if symptomatic or prior known impairment. * Cardiac Function: Ejection fraction (EF) ≥ 40%, no uncontrolled angina, severe uncontrolled ventricular arrhythmias, or electrocardiographic evidence of acute ischemia or active conduction system abnormalities * Able to be off prednisone or other immunosuppressive medications for at least 3 days prior to Natural Killer (NK) cell infusion (excluding preparative regimen pre-medications) * Women of child bearing potential and men with partners of child bearing potential must agree to use effective contraception during therapy and for 4 months after completion of therapy. * Voluntary written consent Exclusion Criteria: * Bi-phenotypic acute leukemia * Transplant \< 60 days prior to study enrollment * Pregnant or breastfeeding - The agents used in this study include those that fall under Pregnancy Category D - have known teratogenic potential. Women of child bearing potential must have a negative pregnancy test within 14 days of study treatment start * Active autoimmune disease * History of severe asthma, presently on chronic medications (a history of mild asthma not requiring therapy is eligible) * New or progressive pulmonary infiltrates on screening chest x-ray or chest CT scan that has not been evaluated with bronchoscopy, if feasible. Infiltrates attributed to infection must be stable/improving (with associated clinical improvement) after 1 week of appropriate therapy (4 weeks for presumed or documented fungal infections). Surgical resection waives any waiting requirements. * Uncontrolled bacterial or viral infections - chronic asymptomatic viral hepatitis is allowed * Pleural effusion large enough to be detectable on chest x-ray * Known hypersensitivity to any of the study agents used * Received investigational drugs within the 14 days before enrollment * Known active CNS involvement Criteria For Initial Donor Selection: * Related donors (sibling, parent, offspring, parent or offspring of an HLA identical sibling) * 14-75 years of age * At least 40 kilogram body weight * In general good health as determined by the evaluating medical provider * HLA-haploidentical donor/recipient match (low resolution) * Not pregnant * Agree to undergo donor viral screening panel * Able and willing to undergo apheresis * Voluntary written consent