ST. AUGUSTINE, Fla. -

The series of events surrounding the family of Haleigh Cummings and her disappearance shows no signs of letting up.

The latest developments:

  • Haleigh's step-grandmother, Lisa Croslin, was arrested Thursday in Tennessee on a Putnam County warrant on charges including forgery.
  • Haleigh's step-uncle, Hank Croslin Jr., was released from the Putnam County jail Thursday after an arrest on grand theft.
  • Deputies in both Putnam are questioning a woman who dropped off a letter containing a tip about Haleigh's disappearance to the St. Augustine Record on Wednesday.

Lisa Croslin, 39, was booked into the Davidson County, Tenn., Jail on charges resulting from an investigation that began last month into checks stolen from San Mateo resident and at least one cashed at Prosperity Bank. She was charged with petty theft and forgery.

Her son, Hank Jr., was arrested on charges he stole a handgun from the same man whose checks were stolen. During his detention, Putnam County investigators questioned him about Haleigh's disappearance and was told he went to the Satsuma mobile home where Haleigh lived with her father about 10 p.m. the night the 5-year-old disappeared and found no one home.

Video:

Misty Croslin-Cummings has told investigators she last saw Haleigh when she went to bed that night.

Haleigh Cummings disappeared sometime the night of Feb. 9 or morning of Feb. 10 from Ronald Cummings' mobile home. She and her younger brother were being watched by Misty Croslin -- at the time Ronald's 17-year-old girlfriend. Weeks after Haleigh disappeared, they were married.

On Wednesday, St. Johns County deputies were called to the St. Augustine Record to take possession of a typed letter about Haleigh dropped off to the attention of Associate Editor Richard Prior. It was signed only with initials.

Investigators have not disclosed the contents of the letter that was left with the newspaper's receptionist about 3 p.m. Wednesday. Prior said the information doesn't point the finger at any individual, but definitely says what happened to Haleigh.

"It will probably solve what happened to Haleigh Cummings," Prior told Channel 4's Dan Leveton about the tip.

Prior said police also thought the tip could solve the seven-month long missing child case "but they have to determine if it's authentic."

Putnam County investigators said they are treating it as important, just as they have with the more than 4,000 other tips they have received since Feb. 10, when Haleigh was reported missing and an Amber Alert was issued.

Late Friday, Schauland said the woman had learned that authorities wanted to talk to her and she voluntarily came to the Putnam County Sheriff's Office.

The woman, whose name was not released, said she was just a messenger delivering the letter for someone else, leaving investigators with questions.

"It has to do with the whereabouts of Haleigh," Putnam County Capt. Dick Schaulan said, and they wanted to talked to the woman to clarify the information. "If it doesn't find Haleigh, it goes in the stack with a lot of the other tips."

Anyone who has any information about what happened to Haleigh Cummings is asked to call Crimestoppers at 888-277-8477.