HEBER SPRINGS, Ark. (AP) — Mindy McCready threatened to kill herself after losing custody of her sons earlier this month, yet she was allowed to leave a court-ordered drug rehabilitation program days before she apparently killed herself, her ex-boyfriend said Monday.

Billy McKnight, who was in a long, rocky relationship with McCready and who is the father of her oldest child, Zander, said the 37-year-old mother of two stayed in the in-patient substance abuse treatment center for about 18 hours before being allowed to walk free.

Authorities say McCready died in an apparent suicide Sunday at her home in Heber Springs, a vacation community about 65 miles north of Little Rock. Sheriff Marty Moss said McCready was found dead on the front porch where her boyfriend, musician David Wilson, died last month of a gunshot wound to the head. Investigators are investigating his death as a suicide, but haven't yet determined the his cause of death.