Ex-DA expected to be key Cosby witness B

philadelphia» An ex-prosecutor is expected to testify that he promised Bill Cosby would never be charged over a 2005 sex-assault complaint, but a judge must decide if that constitutes an immunity deal.

Then-prosecutor Bruce Castor will be a key witness for the defense at a Feb. 2 hearing over what Cosby’s lawyers have called a “nonprosecution agreement.”

The defense argues prosecutors who charged Cosby last month unfairly used his deposition testimony from the accuser’s civil lawsuit against him. Castor supports their position.

But Montgomery County District Attorney Kevin Steele, the prosecutor handling Cosby’s case, said there is no evidence of a signed immunity agreement. Cosby’s lawyers did not attach one to their motion to dismiss the case.