A native of Cambridge, Massachusetts, Hackett made his major league debut with the 1883 Boston Beaneaters. He played in 46 of the team's 98 games, and batted .235 with 24 RBI in helping to lead the team to the National League pennant. He remained with Boston through the 1885 season, then spent 1886 with the National League's Kansas City Cowboys in their only season in the league. In 1887, Hackett's final big league campaign, he played for the Indianapolis Hoosiers in that club's first of three National League seasons. Over five major league seasons, Hackett played in 256 games, batting .216 with eight home runs and 83 RBI, and a .921 fielding percentage in 241 games at catcher.
From 1888 to 1891, he played for the Hyannis town team in what is now the Cape Cod Baseball League. The team was run by Charles Barney Cory and Charles Richard Crane, and featured other major leaguers such as Dick Conway and Barney Gilligan.
Hackett died in his hometown of Cambridge in 1938 at the age of 78, and is interred at St. Paul Cemetery. His brother, Walter, named one of his sons Mortimer Martin Hackett after him.

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