Lawyer John Shannon, 70, of Lakeland, Fla., ran for a state representative's seat in 2014 but lost in the August Republican primary to Colleen Burton, who still holds the office.
The plane crashed shortly after takeoff and the sheriff's office said all of the victims perished upon or immediately after impact.
An airport employee who was photographing the thick fog captured sound of the crash on video. Shannon-Worthington and her husband arrived in Florida Saturday from Baltimore.
Olivia Shannon, 24, was a student at Southeastern University in Lakeland.
The Orlando Sentinel reports that Shannon filed a flight plan to Key West. Victoria Shannon-Worthington and Peter Worthington had traveled to join the family for Christmas from Baltimore.
"Our heart breaks", Judd said.
"Words can not properly express the sadness felt by the Maryland Carey Law community and everyone at the University of Maryland, Baltimore over the loss of Peter Worthington, a third year law student". John Shannon had another daughter from a previous marriage, Liguori said. They were married in June, and her father's Facebook profile photo shows him with his daughters at her wedding.
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Victoria Shannon-Worthington was the 26-year-old daughter of John Shannon. Clayton, a middle school teacher, had a husband and two children - a 3-year-old girl and an 18-month-old.
Shannon was making a 45- to 60-minute flight for day trip to the Florida Keys, the sheriff said.
There were no survivors and "no chance of survival", he said.
He said that John Shannon, a former Marine, took both his legal practice and flying seriously.
Investigators said the twin-engine Cessna 340 took off from Bartow Airbase, near Tampa, about 7.15am (8.15pm) bound for Key West, but it went down near the end of the Bartow runway.
While the cause of the incident is under investigation, "it was very foggy at the time", the sheriff's office said, adding that a fire followed the crash. Shelton said the flight attendant was not injured.