Recipient Inclusion Criteria:

          -  Refractory AML without complete remission (CR) after 2 or more cycles of induction
             therapy (primary induction failure), or AML relapsed after obtaining a CR and failed
             one cycle of re-induction therapy. Standard dose 10-day decitabine (20 mg/m2 daily IV
             x 10 days) or 7-day azacitidine (75-100 mg/m2 daily SC/IV x 7 days) will be
             considered as one cycle of induction therapy.

          -  At least 18 years of age

          -  Deemed to be not otherwise eligible for a non-myeloablative hematopoietic cell
             transplant by the treating physician.

          -  Available HLA-haploidentical donor that meets the criteria in the protocol

          -  Patients with known CNS involvement with AML are eligible provided that they have
             been treated and CSF is clear for at least 2 weeks prior to enrollment into the
             study. CNS therapy (chemotherapy or radiation) should continue as medically indicated
             during the study treatment.

          -  Karnofsky performance status > 60 %

          -  Adequate organ function as defined below:

               -  Total bilirubin < 2 mg/dl

               -  AST(SGOT)/ALT(SGPT) < 3.0 x IULN

               -  Creatinine within normal institutional limits OR creatinine clearance > 60
                  mL/min/1.73 m2 by Cockcroft-Gault Formula

               -  Oxygen saturation ≥90% on room air and adjusted DLCO of at least 40%

               -  Ejection fraction ≥40%

          -  Able to be off of corticosteroids (10 mg or less of prednisone or equivalent doses of
             other systemic steroids are allowed) and any other immune suppressive medications
             beginning on Day -3

          -  Women of childbearing potential must have a negative pregnancy test within 28 days
             prior to study registration. Female and male patients (along with their female
             partners) must agree to use two forms of acceptable contraception, including one
             barrier method, during participation in the study and throughout the DLT evaluation
             period.

          -  Ability to understand and willingness to sign an IRB approved written informed
             consent document (or that of legally authorized representative, if applicable).

        Recipient Exclusion Criteria:

          -  Relapsed after allogeneic transplantation.

          -  Circulating blast count >30,000/uL by morphology or flow cytometry (cyto-reductive
             therapies including leukapheresis or hydroxyurea are allowed).

          -  Uncontrolled bacterial or viral infections, or known HIV, Hepatitis B or C infection.

          -  Presence of donor specific antibodies (DSA) with Mean Fluorescence Intensity (MFI) of
             >2000 as assessed by the single antigen bead assay, < 6 weeks prior to starting
             transplant conditioning

          -  Uncontrolled angina, severe uncontrolled ventricular arrhythmias, or EKG suggestive
             of acute ischemia or active conduction system abnormalities.

          -  New progressive pulmonary infiltrates on screening chest x-ray or chest CT scan that
             have not been evaluated with bronchoscopy. Infiltrates attributed to infection must
             be stable/ improving after 1 week of appropriate therapy (4 weeks for presumed or
             proven fungal infections)

          -  Known hypersensitivity to one or more of the study agents

          -  Received any investigational drugs within the 14 days prior to the first day of
             transplant conditioning

          -  Pregnant and/or breastfeeding

        Donor Inclusion Criteria:

          -  Related donor (sibling, offspring, or offspring of sibling)

          -  At least 18 years of age

          -  HLA-haploidentical donor/recipient match by at least Class I serologic typing at the
             A&B locus.

          -  In general good health, and medically able to tolerate leukapheresis required for
             harvesting the NK cells for this study.

          -  Ability to understand and willingness to sign an IRB approved written informed
             consent document

        Donor Exclusion Criteria:

          -  Positive for hepatitis, HTLV, or HIV on donor viral screen

          -  Pregnant and/or breastfeeding