This week's installment of "The Walking Dead" shocked fans by killing off not one, but two main characters.

SPOILER ALERT: If you have not seen Season 3, Episode 4 of AMC's "The Walking Dead," titled "Killer Within," proceed with caution.

First, T-Dog was bitten whilst cut off from the group, sacrificing himself to the walkers so that Carol could escape.

But the episode's most painful scene came after Lori went into labor, when the heroic mom decided to have a C-section to save the baby, despite knowing that it would kill her.

After Maggie safely delivered Carl's new sibling, and Lori tearfully said goodbye to her son, Carl had to shoot his mom in the head to stop her from turning into a walker. We think we may be traumatized for life.

"The Walking Dead" airs Sundays at 9 p.m. ET on AMC.

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What did you think of T-Dog and Lori's deaths? Do you think the show is getting too dark, or are you digging the high stakes? Weigh in below!

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  • "The Sorrowful Life"

    Rick Grimes (Andrew Lincoln)

  • "The Sorrowful Life"

    A walker.

  • "The Sorrowful Life"

    Glenn (Steven Yeun) and Maggie Greene (Lauren Cohan)

  • "I Ain't a Judas"

    Merle Dixon (Michael Rooker)

  • "I Ain't a Judas"

    Merle Dixon (Michael Rooker), Beth Greene (Emily Kinney), Rick Grimes (Andrew Lincoln), Daryl Dixon (Norman Reedus)

  • "The Suicide King"

    Andrea (Laurie Holden)

  • "The Suicide King"

    Merle Dixon (Michael Rooker)

  • "The Suicide King"

    Maggie Greene (Lauren Cohan), Rick Grimes (Andrew Lincoln) and Daryl Dixon (Norman Reedus).

  • The Walking Dead Season 3 Cast

    (L-R) Lori Grimes (Sarah Wayne Callies); Carl Grimes (Chandler Riggs); Daryl Dixon (Norman Reedus); Carol (Melissa Suzanne McBride); T-Dog (Robert 'IronE' Singleton); Beth Greene (Emily Kinney); Hershel Greene (Scott Wilson); Rick Grimes (Andrew Lincoln); Maggie Greene (Lauren Cohan); Glenn (Steven Yeun); The Governor (David Morrissey); Michonne (Danai Gurira) and Andrea (Laurie Holden) - Photo Credit: Frank Ockenfels/AMC

  • The Walking Dead Season 3, Episode 1 Stills

    (L-R) Daryl Dixon (Norman Reedus), Maggie Greene (Lauren Cohan), T-Dog (Robert 'IronE' Singleton), Glenn (Steven Yeun) and Rick Grimes (Andrew Lincoln).

  • The Walking Dead Season 3, Episode 1 Stills

    (L-R) Rick Grimes (Andrew Lincoln), T-Dog (Robert 'IronE' Singleton), Daryl Dixon (Norman Reedus), Glenn (Steven Yeun) and Maggie Greene (Lauren Cohan) .

  • The Walking Dead Season 3, Episode 1 Stills

    Maggie Greene (Lauren Cohan).

  • The Governor

    The Governor (David Morrissey)

  • Merle

    Merle (Michale Rooker).

  • Rick Grimes

    Rick Grimes (Andrew Lincoln).

  • Michonne

    Michonne (Danai Gurira).

  • The Walking Dead Season 3, Episode 1 Stills

    Your friendly jail zombie.

  • The Walking Dead Season 3, Episode 1 Stills

    Your friendly neighborhood zombie.

  • Michonne & Friends

    Michonne (Danai Gurira)