SANTA FE POLICE ARE LOOKING FOR A MAN WHO SET FIRE TO THE APARTMENT BELONGING TO HIS ESTRANGED GIRLFIREND AND THEIR SON. AND INVESTIGATORS ARE ASKING THE PUBLIC FOR HELP, BECAUSE THEY SAY HE COULD STRIKE AGAIN. RAY SEVA HAS THE STORY FROM OUR SANTA FE BUREAU. FROM THE OUTSIDE OF THIS UNIT AT THE 'CASA ENTRADA'APARTMENT COMPLEX, YOU CAN CLEARLY SEE BOARDED-UP WINDOWS AND CHARRED DEBRIS. THE INSIDE IS TOTALLY GUTTED. IT BELONGED TO SONIA ORTIZ--THE EX-GIRLFRIEND OF DAVID IGNACIO SANDOVAL--AND THEIR TWO-YEAR- OLD SON. FRIDAY NIGHT POLICE SAY HE WENT THERE TO GET SOME OF HIS STUFF. 'while he was there he contacted the victim on the telephone from inside the apartment, and stated that he was going to set the apartment on fire.' POLICE SAY HE'D BEEN UNSUCCESFUL IN TRYING TO WIN ORTIZ BACK, SO SANDOVAL DOUSED THE INSIDE WITH GASOLINE AND SET IT ON FIRE...DESTROYING EVERYTHING INSIDE, INCLUDING THE BOY'S BELOVED PET RABBIT. THERE'S NOW A WARRANT FOR HIS ARREST. POLICE SAY HE AND ORTIZ HAD A...