NCIS: Los Angeles' Marty Deeks may be in more trouble than anyone suspected.

The LAPD detective is under investigation by Internal Affairs, and while Hetty (Linda Hunt) believes it has to do with Deeks' (Eric Christian Olsen) and Kensi's (Daniela Ruah) workplace romance, Olsen believes something more sinister is afoot.

'NCIS: LA' Season 7 Spoilers: Tony DiNozzo's Los Angeles Mission Revealed, Eric Christian Olsen Teases 'Amazing' Scenes

"It's tough," says Olsen told Entertainment Weekly. "I think he's covering something up, something catastrophic. I think he probably gets sent back to LAPD at some point. I think he's hiding it from everybody, he's been hiding it from himself. Whatever it is, I only hope he did it for the right reasons."

Despite his theories, Olsen maintains that he has yet to find out the truth. While the actor could be bluffing, his lack of knowledge may indicate that viewers will have to wait until late in the season to find out exactly what's going on with the shaggy-haired detective.

'NCIS: LA' Season 7: Premiere PHOTOS Revealed, Callen & Sam Reunite Over A Dead Body

NCIS: LA will open season 7 with "Active Measures." The CBS drama left fans without a summer cliffhanger, but the premiere will hook viewers back in with an explosive Callen-centric episode (see video below). Chris O'Donnell's character is about to go rouge, and his unauthorized antics will shake the OSP team to the core.

Catch NCIS: LA Mondays at 10 p.m. ET starting Sept. 21 on CBS.