CHENEY, Wash. – The Seattle Seahawks signed second-round draft pick Lofa Tatupu on Sunday, leaving first-round selection Chris Spencer as the team’s only unsigned rookie.

Tatupu, a linebacker out of USC, joined the team for Sunday’s early workout. He didn’t have time to study a playbook, relying on his memory from minicamps as Seattle practiced in full pads on the third day of camp.