Kelsey Berreth's parents believe that their daughter was killed because of a custody fight.
They amended a wrongful a wrongful death lawsuit against Kelsey's accused murderer and former fiance Patrick Frazee.
Cheryl and Darryl Berreth's suit now claims that Patrick Frazee may have murdered Kelsey to gain sole custody of the couple's one-year-old daughter, Kaylee.
A judge last week ruled that Cheryl Berreth and her husband would maintain temporary custody of the baby with a hearing set for April, 2019.
Frazee is charged with first-degree murder despite the fact that no body has ever been found in the crime.
In another development Frazee's ex-mistress, Krystal Lee Kenney, appeared in court and stated that she destroyed Berreth's phone after she was murdered by her former fiancé.
Kelsey Berreth, 29, was last seen alive on Thanksgiving Day at a grocery store in Woodland Park, Colorado.
The altered suit stated 'Frazee had motive to kill Kelsey in that he wanted full custody' of their one-year-old daughter Kaylee.
The lawsuit also listed what it considered to be untrue statements Frazee made to the press, including a claim by the accused murderer that Kelsey had 'issues' that would warrant him 'getting full custody.'
The 16-month-old is temporarily in the custody of her maternal grandparents ahead of Frazee's murder trial.
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