  We present an investigation of the lepton energy distributions in the
inclusive semileptonic weak decays of heavy baryons performed within a
relativistic quark model formulated on the light front (LF). Using the
heavy-quark LF distribution functions related to the equal time momentum wave
functions taken from the Kalman--Tran--D'Souza model we compute the electron
energy spectra and the total semileptonic widths of the Lambda_Q and Xi_Q
(Q=c,b) baryons and confront the results with existing data.
