San Francisco 49ers wide receiver Dwight Clark (87) spikes the football after making "The Catch" with 51 seconds left during an NFL 1981 NFC Championship Game against the Dallas Cowboys at Candlestick Park, Sunday, Jan. 10, 1982. The 49ers defeated the Cowboys 28-27.

San Francisco 49ers Wide Receiver Dwight Clark (87) runs after catching ball during an NFL football game against the Los Angeles Rams on Sunday, January 2, 1983. The Los Angles Rams beat 49ers 21-20.

Wide receiver Dwight Clark of the San Francisco 49ers.

San Francisco 49ers wide receiver Dwight Clark (87) looks on from the bench during the NFL football game between the San Francisco 49ers and the Philadelphia Eagles on September 23, 1984 in Philadelphia, Pennsylvania. The 49ers won the game 21-9.

San Francisco 49ers' head coach Bill Walsh, center, shares a laugh with quarterback Joe Montana, in red jacket at right, and receiver Dwight Clark, left, during picture day at San Francisco's Candlestick Park, Jan. 16, 1985. The 49ers will meet the Miami Dolphins in Super Bowl XIX on Sunday.

San Francisco 49ers wide receiver Dwight Clark (87) runs the ball during Super Bowl XVI Jan. 24, 1982, at the Pontiac Silverdome in Pontiac, Mich. The San Francisco 49ers defeated the Cincinnati Bengals 26–2.

Former San Francisco 49ers wide receiver Dwight Clark runs onto the field before the start of the "Legends of Candlestick" flag football game Saturday, July 12, 2014, in San Francisco.

San Francisco 49ers wide receiver Dwight Clark (87) makes a catch during an NFL football game against the New Orleans Saints on Sunday, Sept. 16, 1984, in San Francisco. The 49ers won the game, 30-20.

San Francisco 49ers wide receiver Dwight Clark (87) runs upfield during an NFL game against the Dallas Cowboys at Candlestick Park on December 22, 1985. The 49ers defeated the Cowboys 31-16.

Dwight Clark, the 49er who caught the touchdown in the last minute of the game to beat the Dallas Cowboys and win the championship, gives a little wave as he goes aboard chartered jetliner that will take him and the team to Detroit, Jan. 17, 1982. The team starts final preparation for their game with the Cincinnati Bengals next Sunday.

San Francisco 49ers wide receiver Dwight Clark (87) and 49ers Hall of Fame quarterback Joe Montana (16) at the NFL Pro Bowl, a 16-13 AFC victory on January 31, 1982, at Aloha Stadium in Honolulu, Hawaii.

San Francisco 49ers wide receiver Dwight Clark (87) runs upfield with a reception during game against the Los Angeles Rams at Anaheim Stadium, Oct. 27, 1985. The 49ers defeated the Rams 28-14.

San Francisco 49ers wide receiver Dwight Clark (87) scores on a 14-yard reception during game against the Los Angeles Raiders at the Los Angeles Coliseum, Sept. 22, 1985. The 49ers defeated the Raiders 34-10.

San Francisco 49ers wide receiver Dwight Clark runs the football during an NFL football game against the Los Angeles Rams in San Francisco on Monday, December 9, 1985.

San Francisco 49ers wide receiver Dwight Clark (87) runs with the ball after catching a pass during the NFL 1985 NFC Divisional playoff game against the New York Giants on December 29, 1985 in East Rutherford, New Jersey. The Giants won the game 17-3.

San Francisco 49ers wide receivers Jerry Rice (80) and Dwight Clark (87) hug during an NFL game against the Indianapolis Colts on Sunday, Oct. 5, 1986, in San Francisco. The 49ers won the game, 35-14.

San Francisco 49ers wide receiver Dwight Clark (87) catches a 14-yard touchdown pass during an NFL game against the New Orleans Saints in San Francisco, Nov. 13, 1983. The 49ers defeated the Saints 27-0.

San Francisco 49ers wide receiver Dwight Clark (87) prepares to ascend the dugout steps to take the field before an NFL game in 1982.

San Francisco 49ers wide receiver Dwight Clark (87) catches a pass in front of Los Angeles Rams cornerback Lucious Smith (23) during an NFL game at Candlestick Park on October 25, 1981. The 49ers defeated the Rams 20-17.

San Francisco 49ers receiver Dwight Clark, playbook in hand, walks the turf of Candlestick Park before the start of the Dallas Cowboys-49rers match-up in San Francisco, Dec. 19, 1983.

San Francisco 49ers wide receiver Dwight Clark (87) and quarterback joe Montana (16) talk during an NFL game against the St. Louis Cardinals, Sunday, Nov. 9, 1986 in San Francisco. The 49ers won the game, 43 to 17.

San Francisco 49ers wide receiver Dwight Clark (87) heads downfield during an NFL football game against the Kansas City Chiefs on Sunday, Nov. 17, 1985 in San Francisco, Calif. The 49ers won the game, 31-3.

San Francisco 49ers wide receiver Dwight Clark (87) runs upfield during the 1984 NFC Championship Game against the Chicago Bears in San Francisco, Calif., Jan. 6, 1985. The 49ers shutout the Bears 23-0.

San Francisco 49ers wide receiver Dwight Clark (87) eludes Minnesota Vikings cornerback Rufus Bess (21) during an NFL game in San Francisco on Saturday, December 8, 1984. The 49ers defeated the Vikings 51-7.

San Francisco tight end Russ Francis and wide receiver Dwight Clark exchange high fives during the 49ers 38 - 16 victory over the Dolphins in Super Bowl XIX on January 20, 1985 at Stanford Stadium in Palo Alto California.

Former San Francisco 49ers wide receiver Dwight Clark during an NFL regular season game against the Atlanta Falcons on Monday, Dec. 23, 2013 in San Francisco. The 49ers won the game, 34-24.

Former San Francisco 49ers quarterback Joe Montana, left, and former wide receiver Dwight Clark are shown before an NFL football game between the San Francisco 49ers and the St. Louis Rams in San Francisco, Sunday, Dec. 4, 2011.

San Francisco 49ers head coach Bill Walsh and wide receiver Dwight Clark (87) walks out of the locker room before an NFL game against the Los Angeles Rams at Candlestick Park on December 2, 1982 The 49ers defeated the Rams 30-24.

Former wide receiver Dwight Clark, center, speaks next to former San Francisco 49ers owner Edward DeBartolo Jr., left, during halftime of an NFL football game between the 49ers and the Dallas Cowboys in Santa Clara, Calif., Sunday, Oct. 22, 2017.

San Francisco 49ers Hall of Fame quarterback Joe Montana (16) hugs wide receiver Dwight Clark (87) during an NFL Super Bowl XIX game against the Miami Dolphins at Stanford Stadium January 20, 1985. The 49ers defeated the Dolphins 38-16.