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We present optical and infrared spectra of SN 1999ex that reveal a clearexample of an intermediate Type Ib/c case. This suggests a continuousspectroscopic sequence between Type Ib and Type Ic supernovae. We report UBVRIzphotometric observations of SN 1999ex that started only one day afterexplosion, which permitted us to witness an elusive transient cooling phasethat lasted 4 days. The initial cooling and subsequent radioactive heatingproduced a dip in the lightcurve which is consistent with explosion modelsinvolving core collapse of evolved massive helium stars, and inconsistent withlightcurves resulting from the thermonuclear runaway of compact white dwarfs.Comment: 6 pages, 4 figures, to appear in ``From Twilight to Highlight: The  Physics of Supernovae'', Eds. W. Hillebrandt and B. Leibundgut, Springer  Series ``ESO Astrophysics Symposia'', Berli

Evidence for Core Collapse in the Type Ib/c SN 1999ex