NORRISTOWN, Pa. — Bill Cosby arrived at court this morning for Day 6 of his sexual assault trial and the start of the defense side of the case, accompanied for the first time by his wife of 53 years, Camille.

It was the first time during the trial of the comedian once known as “America’s Dad” that a family member was at his side. The couple have four daughters.

The prosecution rested its case Friday after five swift days of testimony in the case that could send the 79-year-old Cosby to prison for the rest of his life. Today, the question hanging over the case is whether the TV star himself would testify.

Cosby could charm jurors by testifying. But experts said the legal risks would be considerable.

Accuser Andrea Constand, 44, has told her side of the story. The jury also heard Cosby’s version in the form of his police statement and his lurid deposition in her 2005 lawsuit.

Cosby’s spokesman said last week that Cosby might take the stand, but his lawyers were mum.

“He could be a fantastic witness. ... He’s an actor and he’s a very good actor,” said Duquesne University School of Law professor Wes Oliver. But “he is potentially opening the door to a whole lot of cross-examination that they fought really hard to keep out.”

Prosecutors wanted 13 other accusers to testify at the trial, but the judge allowed just one, an assistant to his agent at the William Morris Agency.

The trial would move to closing arguments if the defense decided not to put anyone on the stand.