It wasn't clear why 25-year-old John Nicholas Jonchuck threw his daughter or whether she was alive at the time, though an officer who witnessed it said he "thought he heard the child scream," St. Petersburg police Chief Anthony Holloway said at a news conference.
Police records said Jonchuck was separated from Phoebe's mother and the two had a rocky relationship, with Jonchuck trying to get a restraining order against her as recently as last month. Jonchuck had custody of Phoebe and they lived with his father in Tampa.
Both she and Jonchuck had several run-ins with authorities over domestic violence situations, according to documents.
Today, just after midnight, police saw Jonchuck's Chrysler PT Cruiser speeding toward the Sunshine Skyway bridge at 100 mph (160 kph). By the time an officer caught up with him, Jonchuck had pulled over.
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Jonchuck got out and started toward the officer, who pulled his weapon. Then Jonchuck went around to the passenger side of his car and got Phoebe out from the back seat and tossed her over the railing.
Jail records didn't list the name of Jonchuck's attorney. Phoebe's body was recovered an hour and a half later about a mile from the bridge. Rescue crews tried to revive her.
After throwing his daughter, officers said Jonchuck got back in the car and led police on a chase into a neighbouring county. At one point, he turned his car around and started driving toward officers. They eventually stopped him with traffic spikes.