49ers SS C.J. Spillman has been working with the first-team defense during OTAs.
Spillman was featured primarily on special teams last season, but still has developmental upside, and could be used in tandem with Donte Whitner on obvious passing downs. "We've had time to have a full spring with him," DB coach Ed Donatell said. "He's more mature as a professional, he's done a great job with our special teams and he's looking to increase his role. Things are great for him."