A Scottsdale mother accused of holding her newborn under water until the girl stopped moving says she didn't know she was pregnant until just before giving birth, according to court records.

A police report filed in Maricopa County Superior Court shows that Cynthia Joyce Tureman, 28, told Scottsdale police she was trying to hide her pregnancy from her husband, who had a vasectomy five years ago.

The report says Tureman wrapped the baby in a plastic bag, stowed it in the trunk of her car and took her other three children with her to drop the newborn in a trash bin at a gas station.

Tureman told Scottsdale police that she gave birth in a bathtub filled with a foot of water in the master bathroom of her Scottsdale home, according to the report.

Tureman was booked Friday on suspicion of first-degree murder. She was jailed without bond in a Maricopa County detention center.