The FBI is investigating the death of former Colts owner Jim Irsay.

The Colts acknowledged the existence of the investigation on Thursday, but have not been contacted by officials, and no subpoenas have been issued.

Irsay died in May from what was described as cardiac arrest.

The FBI is seeking records and information about Irsay’s death, substance use, and his relationship with Dr. Harry Haroutunian, who reportedly prescribed him pain pills and ketamine.