Casey, who had led the Raptors to three consecutive 50-win seasons, was named coach of the Detroit Pistons on Monday.
His path to an National Basketball Association head coaching job is unconventional, to say the least.
The Raptors also interviewed San Antonio Spurs assistant coach Ettore Messina and Lithuanian Basketball League coach Sarunas Jasikevicius for the head coaching job, according to Sports Illustrated.
On Tuesday, the Raptors finally chose to move forward with Nurse, according to ESPN's Adrian Wojnarowski, in an effort to get a new lead voice in the locker room but not go through a total staff change given their success developing players and in the regular season. Nurse emphasized more man and ball movement as well as outside shooting, helping the team go from last in assists the year before to sixth in 2017-18. He also won two rings at the minor-league level.
In 2007, he became the head coach of the Iowa Energy in the then-NBA D-League, and was a coach in that league until 2013 when he became a Raptors assistant.
The terms of the deal were not announced yet. Nevermind that Casey is a legitimate contender for Coach of the Year-General Manager Masai Ujiri felt the team needed a new leader.
"I leave here with my head high", he told TSN via text message in May.