Does the use of a prosecutor's stipulation that a cooperating witness is testifying truthfully violate the constitutional guarantees of a fair trial, due process, and an impartial jury?

QUESTION PRESENTED When the only evidence offered to support a murder conviction is the testimony of the government’s cooperating witnesses, does it violate the Constitutional guarantees of a fair trial, due process, and an impartial jury when the jury is permitted to take an official court document into its deliberations wherein the prosecutor stipulates the government’s star witness is testifying truthfully? i