"Criminal Minds" season 10 spoilers reveal that Garcia will try to overcome trauma from the season finale's shooting incident. Meanwhile, "Dexter" alum C.S. Lee will guest star as a creepy killer.

Executive producer Erica Messer revealed "Criminal Minds" season 10 spoilers to TVLine as she said that finding himself surviving a near-death experience was a very "traumatic event."

"It was certainly something Garcia's never done and certainly isn't used to," she said, adding that symptoms of post-traumatic stress syndrome will gradually show themselves on Garcia and even Spencer Reid.

Meanwhile, the website revealed that "Dexter" star C.S. Lee will make an appearance on the second episode as a high school English teacher "with a deadly obsession that began in adolescence, when his academically rigorous father would make him and his older brother read in their shed for hours as punishment for supposedly poor grades."

A.J. Cook (Jennifer Jareau) also dished out "Criminal Minds" season 10 spoilers to Zap2it blog as she said that the first episode will pick up where they left off "in the middle of that shootout guns a blazing."

"We also learn a huge secret about one of the other characters that will forever change the face of the BAU," she said.

Earlier, TVLine dished out "Criminal Minds" season 10 spoilers when it revealed that Jennifer Love Hewitt will play the role of Kate Callahan, an undercover agent from the FBI who was transferred to the Behavioral Analysis Unit due to her "stellar work."

Showrunner Erica Messer told the website: "We're thrilled to introduce a new special agent by adding the very talented Jennifer Love Hewitt to our amazing cast. Many of us on the show have enjoyed working with her over the years and look forward to again. We have exciting storylines planned for her character and the entire BAU team as we head into our 10th season."