SANTA CLARA -- The 49ers have signed someone from behind enemy lines: former Seattle Seahawks tight end Cameron Morrah.
While Morrah will vie for a backup spot, he also will bring inside knowledge of the Seahawks to a 49ers team seeking its third straight NFC West title.
Morrah, a Cal product, battled injuries in four seasons with the Seahawks. After totaling 16 catches in 27 regular-season games, he spent last season on injured reserve with a toe injury.
Garrett Celek and converted defensive lineman Demarcus Dobbs are the 49ers' only other tight ends behind starter Vernon Davis, at least until next week's draft.
The 49ers and Seahawks have seemingly made several cat-and-mouse moves this offseason in their battle for division supremacy. Both teams have acquired intelligence officers, if you will, about their rival's inner workings. Last month, the Seahawks signed wide receiver Brett Swain, who spent training camp last year with the 49ers, as did Seahawks offensive tackle Mike Person.
Wide receiver Ricardo Lockette played in 2011 for the Seahawks before spending last season on the 49ers' practice squad. He'll vie for a spot on the 49ers' active roster this year, and he's already become one of quarterback Colin Kaepernick's closest confidants.
Last season's NFC West race came down to the end, as the 49ers went 11-4-1 to finish a half-game ahead of the Seahawks, whose 11-5 mark included a 42-13 rout of the 49ers on Dec. 23 in Seattle.