Authorities have been searching for 57-year-old George Zinkhan since Saturday's shootings in Athens, about 70 miles east of Atlanta. Killed were Zinkhan's wife, Marie Bruce; Clemson University economist Tom Tanner; and Ben Teague.
All three were longtime members of a local theater group in Athens.
In a statement e-mailed to The Associated Press, Chris Zinkhan says the family has been in contact with Athens police detectives and the FBI.
He says the family's "thoughts and prayers are with the victims, their families and their friends."