The Casey Anthony trial ended with so many unanswered questions, it's easy to forget this one:
Who was Caylee's daddy?
The mystery has been exhaustively explored since the 2-year-old's 2008 disappearance. Federal investigators and reporters only come up with more questions.
Is he alive? Is he dead? Does she even know who he is?
The possibilities include four men who died in car wrecks.
Jesse Grund thought he was the father during most of Anthony's pregnancy and much of Caylee's short life, according to news reports. A DNA test ruled him out.
Anthony told some people it was Jesus Ortiz, a high school classmate who died in a 2007 car crash nine months after Caylee was born.
Anthony's mother testified during the trial that her daughter said it was a man named Eric Baker who lived in either Kentucky or North Carolina. But Baker's mother said from her Ewing, Ky., home that she had never heard of Anthony before the hoopla and that Baker would have been 15 when Caylee was conceived.
Baker, too, was killed in a 2007 car crash.
But wait. There's more.
A reporter from The Daily Beast claims she solved the mystery with 100 percent certainty — if you believe 47-year-old Donna MacLean of Rutland, Mass.
McLean told the Beast's Diane Dimond that her son, Michael Duggan, often visited Florida and talked of fathering a child with Anthony years before McLean learned of the child's disappearance and the ensuing media frenzy.
He, too, was killed in a 2007 car crash.
Meanwhile, Melina Calabrese told investigators that Anthony claimed her baby's father was a man named Josh who worked at Universal Studios and had a one-night stand with Anthony in an Orlando hotel.
He was also killed in a 2007 car crash.
Two other men ruled were out by DNA tests: Anthony's father, George, and brother, Lee. Investigators ordered the tests after questions arose about the men possibly sexually abusing Anthony, a claim that played prominently in her trial defense and which both men denied.
In a case filled with mystery, lies and fantasy scenarios, the identity of Caylee's daddy could remain a secret forever.
The most likely reason may be the one Casey Anthony gave a neighbor: She doesn't know the truth herself.
Information from various wire stories was used in this report. Emily Nipps can be reached at firstname.lastname@example.org or (727) 893-8452.