  We report the identification of the unusual emission-line stellar-like object
in the nearby low-metallicity (Z ~ 0.1Zsun) dwarf galaxy NGC 4068. Our
observations performed with long-slit spectrograph and Fabry-Perot
interferometer demonstrate high velocity dispersion in Ha line, presence of
HeII4686A line and peculiarly low [SII]/[NII] fluxes ratio for this object.
From observational data, we derived that the object represents a single star of
high bolometric luminosity L~1.5*10^6 Lsun surrounded by an expanding nebula
with kinematical age of t ~ 0.5Myr. The nebula exhibits significant nitrogen
overabundance (log(N/O) ~ -0.05, that is by ~1.4dex higher than expected for
low-metallicity galaxies). We suggested that this is a massive blue supergiant
(BSG) or Wolf-Rayet (WR) star surrounded by its ejecta interacting with the
interstellar medium. We calculated the models of the nebula using CLOUDY
photoionization code, applying CMFGEN-modelled BSG and WR stars as ionisation
sources. We found a best agreement between the modelled and observed spectra
for the model assuming ionization by low-metallicity WR star of mass M*~80Msun,
ionizing the nebula through the strong wind and enriching the interstellar
medium with nitrogen.
