In Season 3, Episode 9 of 9-1-1: Lone Star, Marjan Marwani has a serious conversation with Paul about his health. After he wakes up from a nightmare, she discovers his heart is racing out of control. Eventually, he gets diagnosed with a rare heart condition called Brugada syndrome. Paul is in denial about what’s going on inside his body so he refuses to get an internal defibrillator inserted.

When he has a sudden heart attack, Marjan allows doctors to follow through with the defibrillator procedure — even though it’s against Paul’s wishes. Unfortunately for Marjan, this decision puts her friendship with Paul on the line. She did what she thought was best for him, knowing it could cause strife.

It's true that Paul is dealing with a lot of serious issues in regards to his heart, but for now, he is still fully part of the show. There are no plans for him to be written out or killed off.