Accused murder mom Casey Anthony’s confession to the murder of her daughter Caylee is contained in the lyrics of her favorite song, says an expert.

Following the death of her adorable 2-year-old, the accused murder mom repeatedly listened to the haunting tune "The Past," by the group Sevendust.

And when Casey was briefly released from jail on bail in August last year, she made a friend listen to the song 13 times in a row.

"This song was in my head the whole time I was in jail," she told her friend. "It reminds me of everything that’s going on in my life."

The song begins: "Beneath the water that’s falling from my eyes lays a soul I’ve left behind…"

"For Casey, the lyrics refer to Caylee’s murder," says Dr. Andrew Hodges, a prominent Birmingham, Ala., psychiatrist and expert at interpreting how criminals reveal themselves subconsciously through what they say and write.

"Casey is grieving for a soul SHE left behind, confessing responsibility for the death."

Another remarkably revealing line goes: "The edge of sorrow was reached but now I’m fine. I’ve filled the hole I had inside."

"Casey has some emotional wound – a hole inside – that caused her to act out her aggression on her daughter. She is sorrowful but able to live in denial," explained the expert.

Dr. Hodges, who has not treated Casey, says some of the lyrics reveal she’s terrified she’ll be convicted of murder.

"I’ll pray (the past) doesn’t scream my name so I light a flame and let it breathe the air that kills the shame."

Casey’s obsession with those lyrics reveals she "hopes her deed and her deep shame over the murder remain hidden. Lighting a flame suggests lighting a candle for someone who died – helping Casey escape the guilt."

The chorus underscores the mom’s frightening mood swings.

"I’m up, I’m down, like a roller-coaster racing through my life. I’ve erased the past again."

Those lyrics suggest the murder was a "manic" action, notes Dr. Hodges. And "erasing the past again" shows that some emotional trauma from her past drove Casey to inflict similar pain on her daughter.

The lyrics "a risky morning, I feel like I’m alive," mean that "she knows she took a big risk with her murderous act but eliminating her daughter made her feel free again."

Perhaps most poignant are the lyrics: "My hate was the last thing I ever felt or thought I could escape."

Concluded the psychiatrist: "Casey is revealing that hate is the last thing she felt for her daughter."