The Pasco County Sheriff's Office has released surveillance video that shows a man running over a pregnant woman Monday.
The Florida Highway Patol is also investigating the incident.
The Tampa Tribune reports Justin Lee Colby, 33, has been arrested and charged with attempted murder.
Investigators say Colby was behind the wheel of the 2006 Dodge Charger as it plowed into Crystal Lynn Noordhuizen as she walked along a residential street in Holiday.
Noordhuizen, 32, is seven months pregnant. She suffered only minor injuries in the incident.
Investigators say Colby is Noordhuizen's boyfriend and the father of her unborn baby. He's being held in the Pasco County Jail.