  We have synthesized K0.95(1)Ni1.86(2)Se2 single crystals. The single crystals
contain K and Ni deficiencies not observed in KNi2Se2 polycrystals. Unlike
KNi2Se2 polycrystals, the superconductivity is absent in single crystals. The
detailed physical property study indicates that the K0.95Ni1.86Se2 single
crystals exhibit Fermi liquid behavior with heavy-fermion-like characteristics.
Transition from the high temperature local charge density wave state to heavy
fermion state below T ~ 30 K results in an enhancement of electron-like carrier
density whereas magnetic susceptibility shows little anisotropy and suggests
presence of both itinerant and localized Ni orbitals.
