Marlin Jackson apparently has less luck than the victims of those “Saw” movies.

On Tuesday, Jackson suffered a ruptured Achilles’ tendon in his right foot, which will end his season – if not his career. The injury comes on the heels of the Eagles’ signing him to a two-year, $6 million deal to be their new free safety despite the fact that he suffered two knee injuries in the previous two seasons. The position now becomes the black hole of Philly’s defense for the second straight season.

What are the Bird’s plans to replace Jackson? O.J. Atogwe is now a free agent, but GM Howie Roseman told the Philadelphia Inquirer that the team won’t pursue the former Rams’ safety. Instead, the Eagles will rely on in-house options like rookie Nate Allen, Quintin Demps or possibly even Macho Harris (a cornerback that started eight games at FS last season) to fill the void created by Jackson’s injury.

Demps was being counted on to replace Brian Dawkins last season, but he had a brutal preseason and then hamstring and ankle injuries limited him to special teams duties throughout the year. Harris made the switch from corner to safety and overtook the starting job from Demps, but it’s clear that his best position is cornerback in nickel and dime packages.

Allen is the most intriguing option of the group. He slid past the Vikings and the Chiefs in the second round of April’s draft and the Eagles were ecstatic to land him with the No. 37 overall pick. He made 39 straight starts to finish out his collegiate career at South Florida, while intercepting four passes in 2009 to earn second-team All-Big East honors. Even when Jackson was healthy, Allen was being given the opportunity to earn the starting position.

All bets are on Allen winning the job this offseason and entering the season as the starter. But if he struggles, the position might once again become a revolving door for an Eagle team that is expected to once again compete for a playoff spot in the NFC.