It is revealed that Wendell checked himself into the facility to expose its abusive practices and help a young woman named Tamara. He was killed by the facility's owners, Carrie and Trey, who then staged his death as an accidental fire in a vacant lot to hide their crime.
With Tamara’s help and a hidden camera Wendell managed to plant, Bobby and Athena successfully bring Carrie and Trey to justice after the couple attempts to frame Bobby for burning down their facility. 9-1-1 Season 6 - Episode 12
The episode uses parallels to show Bobby's growth; it opens with a flashback of Wendell helping a newly sober Bobby in 2018 and ends with Bobby taking on a similar mentor role for a newcomer at an AA meeting. It is revealed that Wendell checked himself into