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An analysis of radiative decays of the neutrinos $\nu_j\to \nu_l \gamma$ isdiscussed in MSSM extensions with a vector like lepton generation. Specificallywe compute neutrino decays arising from the exchange of charginos and chargedsleptons where the photon is emitted by the charged particle in the loop. It isshown that while the lifetime of the neutrino decay in the Standard Model is$\sim 10^{43}$ yrs for a neutrino mass of 50 meV, the current lower limit fromexperiment from the analysis of the Cosmic Infrared Background is $\sim10^{12}$ yrs and thus beyond the reach of experiment in the foreseeable future.However, in the extensions with a vector like lepton generation the lifetimefor the decays can be as low as $\sim 10^{12}- 10^{14}$ yrs and thus withinreach of future improved experiments. The effect of CP phases on the neutrinolifetime is also analyzed. It is shown that while both the magnetic and theelectric transition dipole moments contribute to the neutrino lifetime, oftenthe electric dipole moment dominates even for moderate size CP phases.

Radiative Decays of Cosmic Background Neutrinos in Extensions of MSSM with a Vector Like Lepton Generation