FALL RIVER, Mass. -

Former New England Patriots player Aaron Hernandez and his fiancee traded expressionless glances yesterday as she took the witness stand to testify in his murder trial.

Shayanna Jenkins was called by prosecutors after being granted immunity, which means she was ordered to testify by the court or face time behind bars.

Jenkins, Hernandez's high school sweetheart and the mother of his 2-year-old daughter, appeared to be a reluctant and careful witness, pausing for long periods before answering and saying she couldn't remember details of the time surrounding the June 17, 2013, killing of Odin Lloyd, who was dating her younger sister. Lloyd's bullet-riddled body was found in an industrial park near the home Hernandez and Jenkins shared.

But some of what Jenkins said could hurt Hernandez, including that minutes after she dropped him off at a police station to be questioned about Lloyd's death he directed her to give money to one of his co-defendants.

"He told me to meet up with Bo and give him money," Jenkins said, referring to Ernest Wallace.

Wallace and a third man, Carlos Ortiz, have pleaded not guilty in the killing and will be tried later.

Hernandez, 25, watched Jenkins intently during her testimony, which lasted much of the day. She will return Monday to continue testifying. She previously pleaded not guilty to perjury in connection with the case. Prosecutors say she lied to a grand jury investigating the killing.

Jenkins, also 25, mostly avoided looking at Hernandez while she testified. During a sidebar, she looked at jurors and around the courtroom but not in his direction. It was a change from earlier in the trial, when she would sit behind Hernandez, whispering "I love you" and joking with him.

But she had not appeared in court for the past three weeks. Yesterday, she was wearing the diamond engagement ring she typically wears on her left ring finger.

She first appeared in court yesterday morning outside the presence of jurors and was asked about what she would say on the witness stand. She indicated then that she would say that it was important to Hernandez for her to get rid of a box from the basement and that she took efforts to conceal it as she took it out of the home, contradicting testimony she made before the grand jury. Prosecutors have indicated the box held evidence or even the weapon used to kill Lloyd, which has never been found.

Jenkins wasn't asked in detail about the box on the witness stand yesterday but is likely to be asked about it on Monday.