"Thanks for all the support from family, friends, fans feels good to be back in Detroit,"Smith wrote Tuesday on Twitter . "I'm glad the organization feels I can help this team take the next step. Look forward to the next step in my career. Be blessed people thanks again."
Detroit selected the Central Florida star in the third round of the 2008 draft and he ran for nearly 1,000 yards as a rookie. Injuries over the next two seasons prevented him from matching that production.
The Associated Press contributed to this report.