Lassiter was born in Washington, D.C., but grew up in Raleigh, North Carolina where he attended Athens Drive High School.

[6][7] In 1996, Lassiter won the top goalscorer award in Major League Soccer, scoring 27 goals for Tampa Bay Mutiny,[8] after when he was loaned for 6 months to Italian Serie B side Genoa.

[9] His record in the league's inaugural season was tied several times, but stood until it was broken in 2018 by Josef Martínez of Atlanta United FC.

He ended his professional career with A-League's Virginia Beach Mariners in 2003 as player/assistant coach, but played a few games with Laredo Heat of the Premier Development League and the exhibition Austin Posse in 2004 to help promote their clubs.

[13] On October 8, 1995, he played a third time for the national team, again as a substitute, scoring the game-winning goal in a 4–3 victory over Saudi Arabia.

While Lassiter played consistently for the U.S. in 1997, his appearances tapered off in 1998 and he was selected as an alternate for the 1998 FIFA World Cup roster.

He represented his country in four FIFA World Cup qualification matches[14] and finished his international career with 34 caps and 4 goals.