Joe Gentz pleaded guilty to second-degree murder for the killing of Jane Bashara.
His sentencing was supposed to be at the end of January, but has now been scheduled for Feb. 19 at 9 .m.
He could be sentenced to life in prison.
Gentz has long claimed that Bashara's husband, Bob, was the master mind behind the killing.
Gentz knew the family because he had done odd jobs for Bob.
Jan. 25, 2012
Jane's body was discovered the day after her husband had called police to say she'd gone missing.
Her body was in her Mercedes SUV that was found on Detroit's east side.
Days later, Grosse Pointe Park police named Bob as a person of interest in his wife's death -- but he's never been charged in connection with it.
Special Section: Grosse Pointe Park murder case
Bob Bashara tried to kill Gentz
During his sentencing Bashara said he is "truly and humbly sorry" for hiring a hit man to kill Gentz.
"What I did was inexcusable. I have no one to blame but myself," the Grosse Pointe Park man told the court. "But I understand fully what I did was a crime and something that I will regret for the rest of my life."
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