CHARLOTTE, N.C. — Carolina Panthers owner Jerry Richardson has been readmitted to the hospital, a month after surgery to implant a pacemaker.

The hospital said today the pacemaker is working fine, but doctors planned further tests to determine why Richardson is feeling ill. The 72-year-old Richardson has a history of heart problems and had a quadruple-bypass surgery in 2002.

In 1993, Richardson became the first former NFL player since George Halas to become a team owner. The former Colts receiver caught a touchdown pass from Johnny Unitas to help Baltimore win the 1959 NFL championship.