Police have identified a suspect in the fatal L train fight in Brooklyn as 33-year-old Ryan Beauchamp and have released surveillance video. A verbal and physical altercation on a subway platform lead to Joshua Basin, a college student from Queens being hit by an oncoming train over the weekend . Ryan Beauchamp, 33, is being sought by police in the altercation that caused 20-year-old Basin’s death. Police identified Beauchamp, who is homeless, as a suspect through a previous arrest in connection with an Occupy Wall Street protest on Oct. 8, 2011,