The 61-year-old finished his tenure as the team's winningest coach but could never get it over the hump in the playoffs.
After seven seasons at the helm, Casey was sacked by the Raptors in May despite leading Toronto to a franchise-best 59-23 record during the regular-season. And proving his best days are ahead of him.
Van Gundy was head coach and president of basketball operations. With the offseason officially starting after the Golden State Warriors defeated the Cleveland Cavaliers for the NBA Championship, it was time for the Pistons to pull the trigger.
This led to Casey getting fired, even after being awarded Coach of the Year by his peers.
"Dwane is one of the most successful and highly respected coaches in our league", Pistons owner Tom Gores said.
Prior to his appointment with Toronto, he served as head coach of the Minnesota Timberwolves from 2005-07.
Casey began his National Basketball Association career as an assistant coach with the Seattle Supersonics where he served from 1994-2005 under National Basketball Association head coaches George Karl, Paul Westphal and Nate McMillan.
The Detroit Pistons have a new head coach, despite the fact the team doesn't have a general manager or team president. Dallas posted a 162-84 (.659) mark during that span, winning 50 or more games in each of his three seasons with the team.
In a series of ESPN interviews late last week in conjunction with the N.B.A. finals, Casey spoke optimistically of the Pistons' job and potentially working with the Detroit frontcourt stars Blake Griffin and Andre Drummond. His teams qualified for the playoffs in 11 of those 14 seasons.