( CNN ) The fiancée of former New England Patriots star Aaron Hernandez has been granted immunity , compelling her to testify at his murder trial , according to a decision released by the trial judge on Tuesday . In early January , the fiancée , Shayanna Jenkins , met with Bristol County , Massachusetts , prosecutors in what court documents call an immunity meeting , but the results of that meeting are secret , even from the Hernandez defense team . `` It allows the prosecutor to force her to testify in front of the jury without taking the Fifth '' ( Amendment against self incrimination ) , CNN legal analyst Paul Callan said of the order . `` If she lies , she can still be prosecuted for perjury because a grant of immunity never ( immunizes ) someone against committing perjury on the witness stand . '' Hernandez , the former tight end who once had a $ 40 million contract , has pleaded not guilty to orchestrating the death of Odin Lloyd . He has also pleaded not guilty to weapons charges . His co-defendants , Ernest Wallace and Carlos Ortiz , have also pleaded not guilty and will be tried separately . Jenkins has been a regular at hearings for Hernandez . He has often been seen mouthing `` I love you '' to her . Jenkins is on the prosecution 's witness list . It is not known whether her testimony will help or hurt Hernandez . `` Normally , a fiancée is not going to testify adversely against her true love , '' said Callan , a former New York homicide prosecutor . But there is no privilege in Massachusetts allowing engaged couples to avoid testifying against one another . Prosecutors suspect Jenkins of following instructions from Hernandez to get rid of the murder weapon from their home by removing the gun inside a box , putting it in a black trash bag , and borrowing her sister 's car to take the bag to a dumpster and throw it away . According to court documents , she does n't remember where . Her sister was the girlfriend of the victim and has already testified against Hernandez . Prosecutors said Jenkins , Hernandez 's high school sweetheart , lied to a grand jury several times about the presence of guns in their North Attleboro home , among other issues . She faces possible jail time if found guilty of perjury charges . She has pleaded not guilty . Jenkins and Hernandez are the parents of a daughter who was less than a year old when her father was arrested on June 26 , 2013 . Jenkins ' sister Shaneah was dating Lloyd , 27 , who was shot six times , according to prosecutors . Who 's who in Aaron Hernandez case . Prosecutors allege that on the day after Lloyd 's killing , Jenkins got a coded text message from Hernandez . Search warrants said Hernandez asked Jenkins to get something out of their basement . `` Go ... in back of the screen in movie room when u ( sic ) get home an ( sic ) there is a box ... jus ( sic ) in case u were looking for it ! ! ! Member ( sic ) how you ruined the big tv ... WAS JUST THINKIN bout that lol wink wink love u TTYL ... .K '' TTYL is shorthand for `` talk to you later . '' The evidence against Hernandez : What 's in , what 's out . A home surveillance video shows Jenkins leaving the house about an hour later carrying something `` rigid '' she described as a box , court documents state . She placed it inside a garbage bag , covered it with children 's clothing , and carried the bag to a car and drove away , prosecutors said . Jenkins borrowed her sister 's car , something her sister told investigators she had never done before . When Jenkins returned home , she was seen on the same security system but without the `` rigid '' item . Jenkins told a grand jury she threw the item in a dumpster but could n't remember where , according to prosecutors . Prosecutors suspect the murder weapon was inside . It has not been found . Hernandez 's lawyers have argued there 's no way of knowing what was in the box . `` I mean , who knows ? '' Hernandez co-counsel Jamie Sultan told the court in 2014 . `` It could be drugs , it could be something that was connected to this crime that he knew about , that he was covering up for somebody else after the fact . There are all kinds of possibilities . '' Hernandez 's defense team has filed a motion demanding to know what promises prosecutors may have made to Jenkins . If she made a deal for a lesser charge or immunity , the jury will have to take it into account . `` The jury is going to look at that and say , 'You know something ? He must be guilty if even his fiancée would say that , ' '' said Callan . `` Or the defense would convince them that she 's made such a sweet deal with the prosecution that she 's decided to lie to implicate her lover , '' he added . Callan suggested that if Jenkins is put on the stand as a prosecution witness and repeats her grand jury testimony that she threw out the item without knowing what was inside and ca n't remember where she disposed of it , she could put herself in greater legal jeopardy . That 's because , Callan said , prosecutors could later contend at a perjury trial that she repeated an alleged lie under oath . `` It 's going to increase her guilt if the prosecutor pursues perjury charges , '' Callan said . CNN 's Ray Sanchez contributed to this report .
Aaron Hernandez is on trial in the death of Odin Lloyd . The defense has argued that Hernandez's blood was found at a crime scene and not inside his body. She is on the prosecution 's witness list .