"Long-time North Port resident Chuck Briggs reported to the Sun that he saw Denise Amber Lee around 1:45 p.m. Thursday at the North Port Post Office on U.S. 41. He remembered her struggling with a large package she was mailing, and he held open the door so she could enter. He did not see the two children with Lee. The witness also saw a man waiting in the post office line, about four people behind Lee, whom he now believes was Michael King. He said he made eye contact with King. The witness has reported this information to police."
This would start to fill in the blanks - except for where were her kids?!