A judge ruled John Nicholas Jonchuck incompetent to stand trial. He will instead be hospitalized.
Court-appointed medical professionals determined that Jonchuck has "psychosis" and a "personality disorder."
Prosecutors said he is currently incompetent, but with the proper treatment he is likely to become competent in six to nine months. His next court hearing will be on June 9, according to the Tampa Bay Times.
John Nicholas Jonchuck Jr., 25, was charged with first-degree murder after he allegedly threw his 5-year-old daughter Phoebe off a bridge in St. Petersburg, Florida, early Thursday, ABC Action News reported.
An officer was about to pull over Jonchuck's vehicle for going about 100 miles an hour. He then saw Jonchuck stop the car on the Dick Misener Bridge and throw the little girl over the railing. The officer said he heard the little girl hit the freezing water after falling 62 feet.
Jonchuck, who drove away, was stopped by Manatee County authorities 30 minutes later. After questioning, the St. Petersburg police arrested and charged him with first-degree murder, aggravated assault of an officer, and fleeing and eluding.