Pauley Perrette Reveals How Different 'NCIS' Will Feel Without Michael Weatherly

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NCIS star Pauley Perrette poured her heart out to ET about how much she will miss her longtime co-star Michael Weatherly when he says goodbye to the CBS drama.

"This is the sound of my heart breaking," Perrette said. "Michael's my brother. I love him with all of my heart."

WATCH: Michael Weatherly Is Leaving 'NCIS' After 13 Seasons

On Jan. 5, Weatherly announced that his time on the show was coming to an end after the current season. Weatherly has been with the show for 13 seasons, and NCIS remains the No. 1 show in the world.

"It's not my story to tell," Perrette said when asked about Weatherly's reason for leaving. "It's going to be Michael's story to tell when he feels like it."

Currently, Perrette is focused on another story: helping the homeless. The actress was attacked in November, allegedly by a homeless man, and now she's working with Los Angeles mayor Eric Garcetti to help the estimated 44,000 homeless people living in L.A.

WATCH: Pauley Perrette Is 'Grateful to Be Alive' After Violent Attack

"We do have money budgeted now," Perrette said. "It was a large amount of money that was budgeted, so now we just have to figure out how to allocate those funds."

NCIS airs Tuesdays at 8 p.m. ET/PT on CBS.