The person of interest detained in connection with the murder of UnitedHealthcare CEO Brian Thompson has been revealed ... and his name is Luigi Mangione.
Law enforcement sources tell TMZ ... Mangione is being questioned by authorities in Altoona, Pennsylvania ... though, he has not been charged in connection with the fatal shooting.
The New York Times first reported the person of interest had a written "manifesto" in his possession. Law enforcement sources tell TMZ ... the manifesto is "critical of the healthcare industry."
Mangione's LinkedIn account shows he's a former high school valedictorian, who notably attended the Ivy League school University of Pennsylvania. Mangione is from Maryland, and his last known address was in Hawaii.
Mangione, who also attended the Gilman School in Baltimore, Maryland for his high school years, made his way to UPenn in 2016 ... where he graduated with a degree in Engineering, Computer and Information Science. He continued his studies at the prestigious school for one more year ... earning his Master's degree in the process.