A Minnesota man has been arrested on suspicion of financially exploiting a vulnerable adult after authorities found the bodies of two people who'd been dead for more than a year in the home he shared with his mother and twin brother.

The bodies were discovered Tuesday in White Bear Lake, a St. Paul suburb, after neighbors requested a welfare check because they'd seen no activity and the yard was overgrown.

Autopsies on Wednesday found the two had been dead more than a year. The Ramsey County medical examiner said both were believed to have died of natural causes, and that it might take weeks to identify them.

The man was arrested Tuesday at the scene. Police said he told officers that his 93-year-old mother and 59-year-old twin had died on separate occasions in 2015.