Chaine St. Aubin Downer Jr. (born July 6, 1993), better known by his stage name CJ Fly, is an American rapper and producer from Brooklyn, New York City.

He, along with the rest of Pro Era, joined Wiz Khalifa's Under The Influence Tour in 2013 with A$AP Rocky, Trinidad James, Chevy Woods, Smoke DZA, and more.

With features from various Pro Era members, Buckshot, Ab-Soul, Phife Dawg and production from Chuck Strangers, Statik Selektah, Brandun DeShay, and more, the mixtape has received critical acclaim and made him a candidate for XXL's 2014 and 2015 Freshman List.

[9][10][11][12] On December 9, 2016, a date which happened to coincide with his mother's 49th birthday, CJ Fly released his debut studio album entitled Flytrap.

His single, "Now You Know" was featured in Love & Hip Hop Season 6 - Episode 7 (2017) [15] On March 6, 2020, CJ Fly released his sophomore studio album entitled RUDEBWOY.

CJ's third studio album, the project featured no appearances from Pro Era, however brought in Devin Tracy, Amon Tyson, and Marlon Craft.