The father of 2-year-old Montrell Williams, who is accused of throwing his son into the Bronx River while he was still alive, pleaded not guilty to his charges.
Aruis Williams, 20, from Hunts Point, is charged with two counts of second-degree murder, two counts of first-degree manslaughter and menacing.
Prosecutors say they have surveillance video that shows the alleged suspect standing on the overpass of the Bruckner Expressway with Montrell for a brief period of time before he is thrown into the river below on May 10…