AUTHORITIES HAVE ARRESTED A SUSPECT IN A WATSONVILLE HOMICIDE. ON THURSDAY INVESTIGATORS SURROUNDED A MOTEL IN GILROY WHERE A MURDER SUSPECTED HAD BARRICADED HIMSELF IN A ROOM. AFTER A SEVER AL HOUR STANDOFF POLICE TOOK 38-YEAR-OLD, SELEDONIO DIAZ OF WATSONVILLE INTO CUSTODY. HE IS ACCUSED OF FATALLY STABBING HIS BROTHER, 55- YEAR-OLD FRANCISCO DIAZ DURING AN ARGUMENT ON TUESDAY. SELEDONIO DIAZ WAS BOOKED INTO THE SANTA CRUZ COUNTY JAIL ON MURDER CHARGES.