Prosecutors in Pennsylvania on Thursday asked the judge handling Bill Cosby’s retrial on sexual assault charges to allow testimony from 19 additional women who say Mr. Cosby assaulted them.

The testimony from the other women would help support the account of the chief complainant, Andrea Constand, a former Temple University basketball staff member, and, prosecutors say, help establish that Mr. Cosby was involved in a pattern of sexual assault.

For the first trial, which ended in a hung jury last summer, prosecutors had sought to introduce 13 other accusers as evidence of a pattern of sexual assault. But Judge Steven T. O’Neill, of the Montgomery County Court of Common Pleas, allowed only one to testify, Kelly Johnson.

Judge O’Neill, who will handle the retrial in April, never detailed his reasoning so it is unclear why only Ms. Johnson’s testimony was allowed.

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