Keane, who transferred to CSU last summer from Illinois State, started 20 of 34 games with the Vikings and averaged 4.4 points per game.
While Keane stayed in Canada, the rest of the CSU men's basketball team returned to campus Monday for summer classes.
Among the players enrolled for the second session of summer classes, include CSU's three November signees.
The incoming freshmen class includes 6-foot-6 forward Jibri Blount from Pittsburgh, Pa., 6-foot-2 guard Rob Edwards from Detroit, Mich., and 6-foot-7 forward Jeron Rogers from Houston, Tx.
Blount is the son of Pittsburgh Steelers' great and NFL Hall of Famer, Mel Blount. Rogers is the son of former NBA player, Carlos Rogers.
Keane struggled to find his shot in his lone season with the Vikings. He shot 41 percent (55-for-134) from the floor and 27.3 percent (12-for-44) from three-point range.
The Ajax, Ontario native's best game came in a loss at Oakland where he scored 16 points on 6-for-11 shooting.
As Keane struggled to find his offense, he became one of CSU's best on-the-ball defenders.
In a key home win against Green Bay, CSU head coach Gary Waters credited Keane's defense on Phoenix star Keifer Sykes. Keane held the two-time Horizon League Player of the Year to just 11 points on 4-for-8 shooting.
With the announcement, Keane becomes the fifth member of the 2014–15 team that will not return this coming season.
In addition to Keane leaving, guard Charlie Lee and forward Marlin Mason each graduated in May.
Star players Trey Lewis and Anton Grady, also graduated, but decided to transfer out of the program for their senior seasons.
Lewis, CSU's leading scorer last season at 16.7 points, took his talents to Louisville to play for legendary coach Rick Pitino.
Grady, CSU's second-leading scorer (13.7 points) and top rebounder (7.9 boards), transferred to Wichita State.
The Vikings will have to replace five of its top six scorers from last season. The five departed players combined to score 83 percent (56.2 of CSU's 67.5 points per game) of the Vikings' scoring last season.
With Keane's departure, the Vikings still have one scholarship to offer for next season.
Coaching changes: Gary Waters Waters also made some changes to his coaching staff this summer.
Columbus native Jermaine Henderson replaces Jermaine Kimbrough, who took a similar position at Nevada.
Henderson, a highly-regarded assistant coach with almost 20 years of experience on the sidelines, spent the past three years at Missouri State.
Prior to MSU, Henderson was a mainstay of the Miami of Ohio men's basketball program for 19 years, including 15 seasons as an assistant under legendary coach Charlie Cole.
He has a 3-3 record as an interim head coach of the Redhawks during brief stints in 2007-08 and 2011-12.
Waters is also looking for a new Director of Basketball Operations as Victor Morris announced last month that he is also leaving the program.
Vikings add transfer: Earlier in the week, CSU picked up a commitment from Oral Roberts transfer Bobby Word.
Word, a 6-foot-4 guard, will have two seasons of eligibility remaining after sitting out the 2015-16 campaign, per NCAA transfer rules.
The Lancaster, TX native saw action in 64 career games with the Golden Eagles, making 30 starts. He averaged 7.6 points per game in his two seasons in Tulsa.
Word played in 33 games for ORU last year, making nine starts while averaging 23.1 minutes per game. He averaged 8.4 points and led the team with 65 three-pointers.
Word is expected to arrive on campus in August.