Jeff Metcalf

10:38 AM PT -- Next Generation Action Network president Dominique Alexander began the press conference several minutes after police sorted out the issue ... and he kicked things by ripping Jeff Metcalf for appearing uninvited. He called the man's behavior "inappropriate," and "a disrespect to the…

The brother of the 17-year-old high school athlete who was stabbed to death at a track meet on Wednesday said the tragic incident was all sparked by an argument over a seat. Hunter Metcalf told WFAA his twin brother, Austin Metcalf, got into a tiff with Karmelo Anthony while out at the event in…