GW190521, one of the most massive binary black hole mergers detected by the LIGO-Virgo-KAGRA (LVK) collaboration, fails to be explained by existing models for black hole mass distributions. Even more interesting is the electromagnetic counterpart candidate, an active galactic nucleus (AGN) flare following the gravitational wave event. In our model where the gravitational wave and AGN flare come from a common source, the binary black hole merged while orbiting the AGN’s supermassive black hole. This association has been debated in previous works, but with a newer LVK data release, there is a stronger spatial overlap between the two events, calling for a reanalysis of the association. In this talk, I will present our model for the binary black hole merger within an AGN and the supporting evidence with respect to the existing literature.