Why was LaGuerta killed?

Because LaGuerta was given less than the usual dose, she wakes up in the middle of Dexter and Debra’s dialogue. She tells Debra that she needs to kill Dexter, but a very emotional Debra shoots and kills LaGuerta to protect Dexter’s secret.

Who killed LaGuerta in season 7?

‘Dexter’ Finale Recap: Deb Kills LaGuerta’s Investigation At The End Of Season 7. After a season-plus stretch of Dex-Deb drama in which Deb discovered her brother’s secret, became his accomplice and fell in and out of love with him, she finally sank to his level in the Season 7 finale.

How did LaGuerta figure out Dexter?

Maria LaGuerta found a blood slide at Travis Marshall’s crime scene, and she began to re-investigate the Bay Harbor Butcher Case in an effort to clear James Doakes’ name. Soon, Dexter became her prime suspect as the true Bay Harbor Butcher.