Justin Blackmon
Blackmon started 14 games in his rookie season and enjoyed a productive season. He led rookie wide receivers across multiple stat lines and it appeared that the Jaguars struck gold with their first-round pick. However, substance abuse problems rose their head and crushed his hopes of a great career.

Nobody expected him to crash and burn the way he did in his sophomore year. He played in four games before his time in the NFL came to an abrupt end. Blackmon failed drug tests and received a suspension. Then he did it again and never came back to the NFL. It’s a bizarre story after he promised so much (via CBS Sports).