FORT WORTH, Texas (AP) _ After calling witnesses who said Diane Zamora admitted participating in the murder of a romantic rival, prosecutors prepared to wrap up their case against the former Naval Academy cadet.

Prosecutor Mike Parrish said the last prosecution witness will be Jeff Alcorn, who searched Ms. Zamora's dorm room at the academy in Annapolis, Md. He was expected to testify today.

Prosecutors said several letters were taken from Ms. Zamora's room after roommates told officials she admitted to participating in the killing.

Ms. Zamora, 20, and her ex-fiance David Graham, 20, are accused of capital murder in the December 1995 killing of 16-year-old Adrianne Jones. Prosecutors say the killing was in retaliation for a one-time fling that Miss Jones had with Graham. Graham will be tried this summer.

If convicted, both would face life in prison.

According to prosecutors, Ms. Zamora hit Miss Jones over the head with dumbbell weights in a car, then ordered Graham to shoot her when she tried to flee. Ms. Zamora was a freshman at the Naval Academy and Graham was in his first year at the Air Force Academy when they were charged in September 1996.

The first prosecution witness, Kristina Mason, said Ms. Zamora confessed to her days after the slaying. Testifying Monday, Ms. Mason said her former best friend admitted telling Graham, ``Shoot her, kill her, shoot her!'' after she slammed a weight into the girl's head.

On Thursday, several experts explained complex DNA evidence as prosecutors attempted to prove that Miss Jones' blood was in a car owned by Ms. Zamora's family. Defense attorneys didn't contest the testimony.

The chief Tarrant County medical examiner, Dr. Marc Krouse, testified that injuries on Miss Jones' head could have been caused by weights found in Graham's home.

Parrish has said that even if Ms. Zamora did not strike Miss Jones, she could still be found guilty of capital murder if the jury determines she helped plan the killing or ordered it.