The Queens teenager accused of killing WABC radio newsman George Weber was back before a judge inside a Brooklyn courtroom yesterday. John Katehis, the sixteen-year-old who allegedly responded to Weber's sex ad on Craigslist and the brutally cut him up inside Weber's Brooklyn apartment, was denied bail yesterday in Brooklyn Supreme Court. The East Elmhurst teen has apparently not toned down his act from the time of the arrest when his MySpace page revealed Katehis calling himself a Satanist and posing for self-portraits with knives. When he showed up in court yesterday, the prosecutor noted to the judge, "He has even written on his sneakers 'Satan' and 'Arch-enemy,' " to go along with tattoos on his arm of a pentagram, "666" and the word "Diablo." A lawyer for Katehis said that the writing on his shoes simply referred to a heavy metal band.