A man suspected of killing eight people, most of whom were his relatives, in Chicago-area shootings died after turning a gun on himself following a confrontation with federal law enforcement, police say.

Romeo Nance, 23, was found Monday by US Marshals near Natalia, Texas – more than 1,000 miles from where seven victims were found shot to death Sunday in two homes in the south Chicago suburb of Joliet, according to the Joliet Police Department. Authorities believe Nance is also linked to a Sunday shooting in Will County, Illinois, that left a 28-year-old dead, Joliet Police Chief Bill Evans said Monday.

Nance shot himself with a handgun after being confronted by officials, police said.

Investigators have yet to determine Nance’s motive, but Nance was related to “if not all, a vast majority of the people” found dead in the homes, Evans said during a Tuesday news conference.

The victims have not been publicly identified. They range in age from 14 to 47 years old, Evans said.