04 tahoe leaking water from roof. Help please

[Buster91dg]

Have a 04 tahoe and today I noticed when I went to grab something out of the cargo area in my trunk the right rear pillars was leaking water an dropping onto the floor. This Tahoe doesn't not have the sunroof. It has barn doors I can't find anything about my issue online please help. I pulled the headliner down a little to see what was going on and looks like water was traveling from the seam of the roof but idk how far it's tracking fr