Simplify the following text for a Grade 12 native English-speaking person.
Original: Stephen LaTreal McNair ( February 14 , 1973 â `` July 4 , 2009 ) ( Nicknamed Air McNair ) was an American football quarterback who spent the majority of his NFL career with the Tennessee Titans .
Simplified: Steve LaTreal McNair ( February 14 , 1973 â `` July 4 , 2009 ) was an American football quarterback who used to play for the Tennessee Titans and the Baltimore Ravens of the NFL .