
Mark Hawkins
Mark Hawkins; aka Charlie Brown, is shown as a "contact" on Casey's released cell phone records.
Casey had an affair with Mark, or at least a 'one night stand', around November 2004.
Hence, the possibility Mark Hawkins being Caylee's father.
Additionally:
Mark was married to "Tara"
"Tara" had an affair with Lee Anthony, became pregnant, and had an abortion. Tara broke off the affair with Lee to return to Mark in 12/2006.
----------------------------
Mark Hawkins also had moving violations in Florida:
June 10, 2004- careless driving
Oct 21, 2004 - failure to pay toll
Nov 13, 2004 - failure to obey traffic control device
Orange County Court Clerk Records
Mark's court records proves he was in Florida during Caylee's conception. ( November 2004)
Several variations on Casey's story of who Caylee's father is, ("He" being Caylee's father):
"He was in the military and died in Iraq".= Mark is a Marine, but clearly did not die in Iraq.
"He died in an auto accident on the way to Caylee's first birthday party."
"He died in an auto accident and left behind a wife and another child." (this seems closest to real theory, sans the death part)
Statements made by Casey:
Casey: when she said she talked to "Caylee's father's wife" - a widower- she was referring to Tara.
Casey when saying Caylee's father had a wife and another child-- 'the child' was Tara being pregnant with Lee's baby.

Other wild speculations are that Lee is the father. That is why he did not willingly submit to DNA samples, and had to be subpoenaed for them. Casey claims that Lee did make sexual advances toward her. However, when Casey told Cindy, Casey claims Cindy didn't believe her.