John Nicholas Jonchuck Jr., 25, was arrested shortly after he pulled Phoebe Jonchuck from her pink car seat and threw her from the Dick Misener Bridge into the waters of Tampa Bay some 60 feet below, police said. The dad had custody of the little girl, despite prior domestic violence arrests. APJohn Jonchuck Jr., 25, reportedly sped by a police officer before stopping along a bridge and throwing his daughter, Phoebe, into the waters below, police said. A demented dad tossed his 5-year-old daughter to her death off a Florida bridge early Thursday, then drove off as frantic rescuers tried to recover the little girl’s body, police said. Some 30 minutes after the fatal fall near the Sunshine Skyway Bridge in St. Petersburg, Fla., cops caught up to 25-year-old John Nicholas Jonchuck Jr. and arrested him on murder charges. A St. Petersburg police officer was headed home south on Interstate 275 when a white PT Cruiser blew by him going 100 miles per hour just after midnight Thursday, police said. The officer followed and saw Jonchuck stop the car, pull little Phoebe Jonchuck from her pink car seat and throw the girl over the railing of the Dick Misener Bridge on the approach to the Sunshine Skyway Bridge, which connects St. Pete with Terra Ceia in the Tampa area on Florida’s west coast. WFTSPolice caught up with Jonchuck as rescuers frantically searched for little Phoebe. The girl plummeted some 62 feet to the Tampa Bay waters below while her deranged dad took off, police said. "The officer's initial concern was for the child. He heard the splash," St. Petersburg Police spokesperson Yolanda Fernandez told Bay News 9. "He knew she hit the water. He climbed down to a platform underneath the bridge to try and locate her but the current had already taken her away." ST PETERSBURG POLICE DEPARTMENTCops say Jonchuck sped by an officer in this PT Cruiser before committing the heinous crime. The officer reportedly saw the entire thing and tried unsuccessfully to stop Jonchuck, who was later arrested some 30 minutes later after crossing the Sunshine Skyway Bridge, into Manatee County, the Tampa Bay Times reported. "He (Jonchuck) did not (give any indications why this happened)," St. Petersburg Police Chief Anthony Holloway told the media Thursday morning. "Again, when he got out of the car (Jonchuck) said something but the officer has no idea what he said." ST PETERSBURG POLICE DEPARTMENTRescue teams rushed to the scene but could not revive the girl after she spent nearly two hours in the cold waters. Rescuers from Eckerd College found the girl in the water nearly two hours after the fatal plunge, about a mile from where she was tossed. She died at a hospital around 2:45 a.m., police said. “I’m heartbroken. We were out there looking in the dark. We hit a couple high bars looking as fast as we could, trying to save somebody, but there’s nothing you could do,” Bobby Hay, a fisherman who helped rescue crews search for the victim, told WESH-TV. CHRIS O'MEARA/APThe Sunshine Skyway Bridge is a popular spot for suicides. Jonchuck has previous arrest for domestic violence dating to 2008, online jail records show, and he was busted for DUI and battery in 2013. Despite his checkered past, reports indicate he had custody of his daughter. Jonchuck faces charges of first degree murder, aggravated fleeing and aggravated assault with a deadly weapon. The Sunshine Skyway Bridge, opened in 1987, is more than four miles long. The span has proven a popular suicide spot over the years, with more than 200 people jumping to their deaths, according to one unofficial tally.