Washington State quarterback Connor Halliday throws a pass against Arizona during the first quarter of an NCAA college football game Saturday, Oct. 25, 2014, at Martin Stadium in Pullman, Wash. (Dean Hare/Associated Press)
Connor Halliday. (Dean Hare/AP)

After passing on the opportunity to take a quarterback in this year’s draft, the Washington Redskins appeared to have their long-shot in Washington State’s Connor Halliday.

But when the three-day rookie minicamp got underway Friday, Halliday was not present and no longer on the roster, the team confirmed. According to a source, Halliday decided to retire before his NFL career, brief as it was, had gotten started.

The 6-foot-3, 204-pound Halliday had a prolific career at Washington State, throwing for a school-record 11,304 yards — along with 90 touchdown passes in 35 games. But his draft stock fell following a season-ending injury, and he was passed over, enabling the Redskins to sign him as a college free agent.

Redskins officials offered no explanation for why Halliday wasn’t on the roster after signing him to a contract and assigning him a No. 12 jersey.

Halliday, who hadn’t been able to take part in February’s NFL Scouting Combine or Washington State’s pro day, was the only quarterback believed to have visited Redskins Park for an interview prior to the draft. Having operated almost exclusively out of the shotgun in college, Halliday had been regarded as a talent who was going to take time to acclimate to a pro-style offense.

His abrupt departure leaves the Redskins with the same quarterback lineup as last season: Robert Griffin III, Kirk Cousins and Colt McCoy.

The team invited two quarterbacks to this weekend’s minicamp as tryout players: Georgia’s Hutson Mason, who started all 13 games for the Bulldogs last season and set a school record for completion percentage, 67.9; and Southern California walk-on Anthony Neyer, who appeared in only one game last season in a mop-up role, rushing twice for five yards in a 49-14 rout of Notre Dame.