Police are investigating the cause of a fatal condo fire Saturday in Thornton. Investigators spent the day Sunday sifting through the rubble for evidence.The fire broke out in a first floor unit at the Star Point Condominiums located at 8701 Huron St. around 11:30 a.m. Saturday."Fire (crews) arrived and determined the fire was suspicious and of an unknown origin," said Thornton Police spokesman Matt Barnes.The fire damaged six units and displaced the residents of 14 units in the building.Several hours later, fire investigators discovered the body inside the unit where the fire started. Homicide investigators were called, but information about how the victim died and what started the fire was not available Saturday night. Barnes said the body was discovered at around 2:30 p.m Saturday.Neither the victim's gender nor identity was known late Saturday night; however on Sunday the Ledezma family said they are positive the body is that of their loved one, Liberty.Crime scene investigators from the Colorado Bureau of Investigation were at the condo complex Saturday and Sunday. On Sunday, an accelerant dog was used to determine if any accelerants were used in the fire.Family members said Liberty's mother owns the condo unit."If she wasn't here, her car would not have been here," said Catherine Madril, the property manager and a family friend. "Her car was here. She is the only one not accounted for.""It's heart breaking. She's a young girl, she's a young mother working to support her daughter," said Madril.Liberty's 3-year-old daughter was staying with the girl's grandmother when the fire broke out.A neighbor told 7NEWS the woman's fiance mentioned a dispute at the fire scene."He was distraught, he was upset, he was yelling they had a fight and he wasn't sure what was going on," said Matthew Taylor.The alleged victim's sister said Liberty's fiance is not responsible for the fire or her sister's death."Rodney Tucker was not at the crime scene at that time," said Brittany Ledezma, Liberty's sister. "He was actually at my aunt's house at the time."Brittany said she knows who killed her sister."I am frustrated," said Brittany in tears. "She was helping them out and this happens to her."Barnes said family members and friends of the victim were interviewed Saturday and Sunday, but would not comment on allegations of a dispute at the residence. When asked if anyone was facing criminal charges, Barnes replied, "Not at this time."The Red Cross is helping find temporary housing for 14 residents who were displaced by the fire.