Twice in a Lifetime was a Canadian series that aired on CTV from 1999-2001.
The series follows a celestial judge and a guardian angel, who give recently deceased people three days in which they can return to Earth and correct the big mistake they made while alive.
Mary Beth Lacey and Chris Cagney are teamed up as NYPD detectives in this landmark series. Their opposing personalities mesh to make this one of the great crime-fighting duos of all time.