Wilson died of a self-inflicted gunshot wound on Sunday, reports People.
The couple had been together for two years, and he was the father to McCready's 9-month-old son Zayne.
"David was my soulmate," McCready said in a statement. "He was a precious gift from God to all of us and, yesterday, he returned home and is now with his mother and father.
"David loved and was loved. Those who knew and loved him will miss him; those who did know David missed the opportunity to know a truly loving and gifted man."
McCready gave birth to Wilson's son Zayne in April 2012.
The country singer also has an older son named Zander with singer Billy McKnight.
She became involved in a high profile custody battle over Zander, after she took him from his father's home.