[1] Mellus was born in 1917, at Plymouth, Pennsylvania, the grandson of Lithuanian immigrants, and graduated in 1934 from Hanover High School at Hanover Township, Luzerne County, Pennsylvania.
In December 1941, he was named to the first-team of the Associated Press's NFL All-Star team.
[5] After being drafted into military service in February 1942, Mellus played for the Eastern Army All-Star Team.
In December 1943, he was named to the Associated Press's military service All American team.
[6] Following his discharge from the military, Mellus played in 1946 for the San Francisco 49ers and from 1947 to 1949 for the Baltimore Colts.