After sitting out half the season with a leg injury, the latest setback in three-plus disappointing seasons at Boston College, senior defensive lineman Dillon Quinn decided to leave school for “personal reasons,” coach Frank Spaziani said Thursday.

Quinn was the highest-rated player in the Eagles’ 2009 recruiting class when he came out of Trinity-Pawling in New York. At 6 feet 6 inches and 301 pounds, he was a monster who hunted down quarterbacks in high school. But after redshirting his freshman season, he missed the first three games of the 2010 campaign because of a suspension for violating team rules, and things were spotty from that point on.