Nick Collison has announced his retirement from the NBA in a lengthy first person essay.

Collison was drafted 12th overall by the Seattle SuperSonics in 2003.

"I've played with some incredible players, future Hall of Famers, and had the unique experience of spending my entire career with one franchise, but in two different cities," wrote Collison.

"I love KD. I miss him. I played my best basketball with James (Harden). I wish we would have had more time. I feel like a proud big brother watching Russ become both the player and the man that he is. I really appreciate all the battles we've been through."