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The anomaly in the low energy distribution of quasi-elastic neutrino eventsreported by the MiniBooNE collaboration is discussed.  We show that the observed excess of electron-like events could originate fromthe production and decay of a heavy neutrino ($\nu_h$) in the MiniBooNEdetector. The $\nu_h$ is created by mixing in $\nu_\mu$ neutral-currentinteractions and decays radiatively into $ \nu \gamma$ due to a transitionmagnetic moment between the $\nu_h$ and a light neutrino $\nu$. The energymeasured in the detector arises from the subsequent conversion of the decayphoton into a $\pair$ pair within the detector volume.  The analysis of the energy and angular distributions of the excess eventssuggests that the $\nu_h$ has a mass around 500 MeV and the lifetime$\tau_{\nu_h} \lesssim 10^{-9}$ s. Existing experimental data are found to beconsistent with a mixing strength between the $\nu_h$ and the $\nu_\mu$ of$|U_{\mu h}|^2 \simeq (1-4)\times 10^{-3}$ and a $\nu_h$ transition magneticmoment of $ \mu_{tr} \simeq (1- 6)\times 10^{-9} \mu_B$. Finally, we discussthe reason why no significant excess of low energy events has been observed inthe recent antineutrino data.

The MiniBooNE anomaly and heavy neutrino decay