Dan Rivera's cause of death has finally been officially confirmed. Almost two months after the paranormal investigator unexpectedly died while on tour with the IRL Annabelle doll - you know, the one that inspired The Conjuring franchise - we finally know what happened. On Thursday, the Adams County Coroner revealed the Army vet's death was from natural causes - a heart problem. Coroner Francis Dutrow said in a statement: "Mr. Rivera had a known history of cardiac issues, which were consistent with the findings.