'Our Hearts Are Breaking': New Photos of Caylee Anthony

Caylee Anthony and her mother Casey Anthony in 2008. Caylee has been missing since June. For more exclusive photos watch "20/20" Friday at 10 p.m. ET.

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Casey Anthony Questioned, Charged

Authorities have released more than 400 pages of documents, which revealed that Casey told police that she left Caylee with a baby sitter named Zenaida Fernandez Gonzalez, and that both were missing when she returned.

On July 16, 2008, police took Casey on a journey around the city to try to understand her story about where she had left her daughter.

"When [Casey] took them to the apartment [where] she said she had dropped her daughter off, that apartment had been vacant for almost 140 days," said Pacheco. "No one was living there."

Casey then took the police to two other buildings where she said she'd left Caylee in the care of Gonzalez, but the police could find no such woman and they they could not find anyone who knew Casey at Universal Studios, where Casey claimed to work.

Police took Casey into custody and charged her with child endangerment. The arrest affidavit states that she showed no "obvious emotion" over her daughter's disappearance.

Dozens of photos of Casey partying appeared anonymously on the Internet, amd detectives also discovered a poem that was written on Casey's MySpace page soon after her daughter's disappearance:

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"Trust no one, only yourself. With great power comes great consequence. What is given can be taken away. Everyone lies, everyone dies, life will never be easy."

New Evidence; Bounty Hunter Pays Bond

The police took clothing samples from the Anthony home and dug up their backyard. They also subjected the family car to extensive forensic tests. And in a bond hearing for Casey on July 22, detectives revealed some stunning news.

"They found strands of hair that resembled her daughter's hair in the back of the trunk," said Pacheco. "Cadaver dogs smelled human decomposition in that trunk. When you hear a detective saying that, it was very shocking."

Casey's parents and brother closed ranks around her. They said they believed that Caylee had been kidnapped and the entire family was in danger.

"I think we all feel that the only thing that she's guilty of is not putting the information to the police department as soon as she found out," said her brother Lee Anthony.

For Casey's parents, it was a nightmare playing out in full view of an increasingly skeptical police and a crush of reporters who followed the case even more closely once bounty hunter Padilla offered to post Casey's bond.

"She kept saying, 'Get me out of here. I'll take you to my baby. I'll tell you what happened,'" Padilla said.