Summit County Judge Lynne Callahan upheld the death sentence recommended by a jury after Richard Beasley, 53, was convicted last month of the men's murders, WXIX-TV, Cleveland, reported.
Ralph Geiger, 56, of Akron; David Pauley, 51, of Norfolk, Va.; and Timothy Kern, 47, of Massilon were killed by Beasley and Brogan Rafferty, 16, when the men responded to an ad for a farm hand posted on the Internet classifieds site.
Beasley also was convicted of the attempted murder of Scott Davis, who escaped and notified police after being shot in the arm.
Rafferty was convicted of related crimes last year and sentenced to life in prison.
"I killed no one," Beasley said at the hearing, WOIO-TV, Cleveland, reported. He told families of the victims he was sorry for their losses.