RESIGNED: As both head football coach and athletic director at Vanderbilt, BILL PACE, after a 22-38-3 record in six seasons.
RETIRED: Track and field and cross-country coach at Fordham for 28 years, ARTHUR W. O'CONNOR, effective at the end of this academic year.
SIGNED: By the Boston Red Sox, ORLANDO CEPEDA, 35, ostensibly to fill the team's designated pinch-hitter role.
TRADED: After 17 seasons with the Baltimore Colts, Quarterback JOHNNY UNITAS, 39, to the San Diego Chargers for "future considerations."
DIED: Coach of the 1924 U.S. Olympic fencing team, JULIO MARTINEZ CASTELLO, 91; in Tampa, Fla.
DIED: PHIL KING, 36, an NFL running back during 1958-66; of an accidental gunshot wound; in Memphis.