Olympic sprinter Michael Johnson ran out on Donald Trump Sunday night.

Johnson abruptly left "Celebrity Apprentice" after discovering he had a "personal family situation" to attend to.

The sports star returned to San Francisco to take care of his son after his team presented their Right Guard commercial.

Johnson would not elaborate on the situation, but told Trump his son was "fine" and that he would have stayed if it was "avoidable."

At the end of the show, model Selita Banks was fired for not being "tough" enough.

Meanwhile, Bret Michaels considered leaving the reality series after discovering his daughter may have diabetes.

The show was already short on stars this week.

Sharon Osbourne was absent due to illness while Cyndi Lauper was in Washington for President Obama singing the Hate Crimes Prevention Act.