So here's a little background... The movie stars twin brothers, Trane and Bird Stevens. One is a cop and the other is a con, just released from prison. As the movie begins, the con brother, Bird is narrating as you see him on the Gun Hill Road platform. In the next scene both brothers are riding along the dark night streets of the Bronx, NYC. They are talking and catching up, when all of a sudden, shots are fired! A car chase entails and one brother ends up dead.
In order to keep the death of his brother hidden, he dumps his brother's body in the Hudson and goes about his business [Trane's] as id nothing even happened. Next thing you know, the con, Bird, is taking the identity of his cop brother by dressing as him, taking his wallet, wearing his clothes. Even driving his beat up Lincoln Navigator.
After going home and going to his brothers things , His first stop was his child's mother Jenelle home. Remember he's acting as his brother so, she has no idea he's actually Bird!