Keith Fahnhorst
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| Position | Offensive tackle | ||||||||||||||
| Personal information | |||||||||||||||
| Born | February 6, 1952 St. Cloud, Minnesota, U.S. | ||||||||||||||
| Died | June 12, 2018 (aged 66) Eden Prairie, Minnesota, U.S. | ||||||||||||||
| Listed height | 6 ft 6 in (1.98 m) | ||||||||||||||
| Listed weight | 273 lb (124 kg) | ||||||||||||||
| Career information | |||||||||||||||
| High school | St. Cloud Technical | ||||||||||||||
| College | Minnesota | ||||||||||||||
| NFL draft | 1974: 2nd round, 35th overall pick | ||||||||||||||
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Keith Victor Fahnhorst (February 6, 1952 – June 12, 2018) was an American professional football offensive tackle for the San Francisco 49ers of the National Football League (NFL) from 1974 through 1987. He played college football for the Minnesota Golden Gophers, Fahnhorst, a 273 pound lineman, led the 49ers in seniority and appeared in Super Bowl XVI and Super Bowl XIX games.
Fahnhorst's younger brother Jim Fahnhorst played linebacker in the USFL and for the 49ers from 1984 to 1990. The brothers were teammates on the 1984 49ers team that won Super Bowl XIX and finished with a 15–1 record.