49ers’ Deommodore Lenoir cashes in with contract extension after humble beginnings

SANTA CLARA — As a rookie cornerback, Deommodore Lenoir cost the 49ers their last practice of rookie camp because he inadvertently posted video of himself on social media jamming a receiver too aggressively during a non-contact practice.

A fifth-round draft pick out of Oregon, Lenoir saw the clip actually made SportsCenter and was instantly worried about his fate.

“I was like, ‘This is bad. I might be cut,’ ” Lenoir said Wednesday on the occasion of signing a five-year contract extension...