Tyji Donrapheal Arnstrong (born October 3, 1970) is a former professional American football tight end in the National Football League for the Tampa Bay Buccaneers, Dallas Cowboys, and St. Louis Rams. He played college football at the University of Mississippi.
Armstrong attended Robichaud High School, before moving on to Iowa Central Junior College.
After his sophomore season he transferred to the University of Mississippi, where he was a two-year starter as a blocking tight end. As a senior, he registered 16 receptions for 304 yards (19-yard avg.). He finished his college career with 21 receptions for 388 yards (18.5-yard avg.) and one touchdown.
Armstrong was selected by the Tampa Bay Buccaneers in the third round (79th overall) of the 1992 NFL Draft. As a rookie, he started 7 games and although he was mostly used as a blocking tight end, he was a part of one of the longest passing plays in franchise history, an 81-yard touchdown reception against the Los Angeles Rams on December 6. In 1992 and 1993 he was a backup to Ron Hall, and from 1994 to 1995 to Jackie Harris. He was waived on August 25, 1996.
On August 27, 1996, the Dallas Cowboys signed him for depth purposes after dealing with injuries to tight ends Jay Novacek and Eric Bjornson. He appeared in 16 games with 7 starts, registering 2 receptions for 10 yards. He announced his retirement after the Cowboys didn't re-sign him and selected David LaFleur in the first round of the 1997 NFL Draft.
On July 19, 1998, he was signed by the St. Louis Rams as a free agent. He played as a backup in 12 games, while making 6 receptions for 54 yards. He retired at the end of the season because he felt that he should be starting over rookie tight end Ernie Conwell.
On August 17, 2000, he was signed as a free agent by the Dallas Cowboys. On August 27, he was released to make room for tight end O.J. Santiago.
In 2001, he signed with the Chicago Enforcers of the XFL league and was coached under Ron Meyer. He posted 6 receptions for 49 yards and played with the team until the league folded at the end of its debut season.
His mother suffered a fatal heart attack while watching him play against the Chicago Bears on October 18, 1992.