According to the arrest affidavit, two police dogs trained to detect the odor of decaying human tissue alerted on Sifuentes' Lincoln Navigator while it was parked at the Carrollton police station.
While speaking with investigators, police said, Sifuentes gave several “basic statements of deception, including lying about his date of birth and having tattoos.”
Police said Sifuentes attended the family gathering, but he was being deceptive about leaving the apartment alone at various times throughout the night.
Officials said Jasmen was fatally stabbed after being abducted from a relative's apartment in Carrollton. Authorities said she was taken from the apartment some time after 11:15 p.m. Saturday.
Her body was found facedown shortly after 3:30 p.m. Sunday in the 1100 block of Clint Street, less than a mile away.
According to the affidavit, Jasmen was shirtless and her pants and underwear had been pulled down to her knees “in a manner consistent with sexual assault.”
Mitchell said police can't comment on allegations of sexual assault because lab results are still pending.
A Dallas County medical examiner's office employee said the girl died of a stab wound to the chest. Her death has been ruled a homicide.
Sifuentes was with other adults in the apartment Saturday night, where Jasmen was last seen, police said.
Jasmen was sleeping in a master bedroom with a door that leads to the outside of the apartment. Mitchell said officers think Jasmen was abducted from the bedroom, but officers haven't found any evidence of forced entry into the room.
Relatives realized the girl was not in the bedroom about 15 minutes later and realized that Sifuentes, who lives less than a mile away from the apartment complex, was also missing for about 15 minutes, according to the affidavit.