A former NFL player shot and killed a prominent South Carolina doctor, his wife, two grandchildren and another man before taking his own life at his home a short distance away, authorities said on Thursday.

Phillip Adams, 32, who left the NFL more than five years ago, was found dead hours after the killings of five people on Wednesday at the home of Dr. Robert Lesslie in suburban Rock Hill, South Carolina, York County Sheriff Kevin Tolson said.

Investigators were at a loss to offer a motive for the shooting spree that broke out in the quiet community about 30 miles (48 km) south of Charlotte, North Carolina. "We have probably more questions than you do right now," Tolson told reporters at a briefing.