Amobi Okoye was the 10th overall pick in the 2007 NFL Draft.
But Okoye hasn't flourished, as the Houston Texans had hoped, registering just 11 sacks in four seasons, and he was released.
Okoye knew where he wanted to play next.
"There are a lot of people I know here," Okoye said. "I always wanted to work with coach Rod [Marinelli] and he wanted to work with me too so it was an exciting opportunity for me."
Okoye also said that former Bears defensive tackle Tommie Harris was a "big mentor," perhaps paying homage by picking No. 91.
"Being that Chicago also wanted me to come here, it only made sense to do it," he said.
Okoye signed a one-year deal with the Bears.