A Colorado art teacher allegedly went on a deadly stabbing rampage with a "buck knife" made from an animal antler, plunging it into a man who later died and into two women on Halloween night, cops say.

Matthew Regnier, 33, of Colorado Springs, was found "fully naked and bloodied" while holding a 2-year-old child in his arms by responding officers, who were called to the scene in the 1400 block of El Paso Street just before midnight on Friday, according to an arrest affidavit obtained by Law&Crime.

Colorado Springs Police received multiple calls for a domestic disturbance that evening and were allegedly told by Regnier upon their arrival that he captured events leading up to the stabbing and during it with his cellphone in "selfie mode." He later claimed during police interviews that the

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