Sep 05, 2008 9:16 AM EST

Stephon Marbury's cousin Jamel Thomas has written an autobiography entitled "The Beautiful Struggle" that dishes on the Knicks' point guard, according to New York Daily News.

The book, which is due out in late September, has Thomas alleging that Marbury ruined a potential deal for him with the Timberwolves.

In it, Thomas includes a conversation that he allegedly had with Kevin Garnett, in which Garnett tells him how Marbury's presence on the team spoiled his cousin's chances of signing with Minnesota.

"Stephon's selfish - It's just the way he is," Thomas said. "He never put himself out there at all to help me. He left me out to dry. Too many false promises. I still love him, but he's selfish."

Via New York Daily News