9-1-1 spoilers follow.

9-1-1 delivered a heartbreaking blow to Bobby (Peter Krause) in season 6's midseason finale.

On Monday's (November 28) episode 'Red Flag', the character's AA sponsor Wendall (Maurice Irvin) reaches out to him, leading to concerns, before the latter is later found dead in mysterious circumstances.

The death is a huge blow to Bobby, showrunner and executive producer Kristen Reidel explaining that Wendall was a "very important part" of who Bobby is today.

maurice irvin as wendall, 911 lone star
Fox

Related: 9-1-1: Lone Star adds Lucifer and The Flash stars to season 4

"Bobby is in recovery and Bobby will always be in recovery," she told Entertainment Weekly. "It's a huge part of his life and who he is as a person. It's not the only thing, but it is a big chunk of it. And [Wendall's death] felt like an interesting way to talk about that without Bobby falling off the wagon.

"Wendall was a very important part of the person that Bobby is now, and the life that he has now. In a lot of ways, Wendall didn't just impact Bobby's life, he impacted the family's life — because Bobby had Wendall to turn to instead of turning to drugs or alcohol, and that made their life better."

maurice irvin as wendall, 911 lone star
Fox

Related: Twilight's Billy Burke teases a return to 9-1-1: Lone Star

Reidel went on to reveal that the second half of the season will show Bobby and Wendall's relationship as he searches for "the truths about what really happened".

"We'll get to see the two of them meet and we'll get a sense of that relationship with Wendell meant to Bobby, and also to [Angela Bassett's] Athena," she teased.

"We'll see Bobby and Athena – and a little bit of [Corinne Massiah's] May – try and figure out what happened to Wendall, but also what's going on at this facility that should be helping people but it seems like is maybe abusing them."

9-1-1 and 9-1-1: Lone Star both air on FOX and Hulu in the US and Sky Witness in the UK.

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Sam Warner

Sam is a freelance reporter and sub-editor who has a particular interest in movies, TV and music. After completing a journalism Masters at City University, London, Sam joined Digital Spy as a reporter, and has also freelanced for publications such as NME and Screen International.  Sam, who also has a degree in Film, can wax lyrical about everything from Lord of the Rings to Love Is Blind, and is equally in his element crossing every 't' and dotting every 'i' as a sub-editor.