In prison, Susan Smith, the notorious "killer mom," made a vow during a call, all while plotting to benefit financially from her heinous crimes.

Susan Smith, the South Carolina killer mom, had previously stated that she wouldn't speak to the media, but was later disciplined for doing so, as revealed in newly obtained prison calls by Planet Chronicle Digital.

On Nov. 20, the 53-year-old was not granted parole after 30 years in prison, as she had been convicted of talking to a documentary filmmaker, which was against the rules.

Smith was convicted of communicating with a victim/and or witness of crime on Oct. 3, as previously stated by Chrysti Shain, director of communications with the South Carolina Department of Corrections.

On Aug. 13, Smith informed a male prison caller that she received a letter from a woman who worked for a national media outlet. However, she had already discarded the letter and was unable to read it to the caller.

Smith replied, "The letter was about wanting to converse with me. It's a common theme, like many others... they aim to provide me with an opportunity to share my narrative."

She informed the male caller that she wouldn't engage with them, regardless of the possibility.

Smith then mentioned another letter she received.

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""I received a letter from a man in California, but it was brief and only contained a single line asking if I would like to talk. The letter was handwritten, which made it seem a bit strange. I think I'll throw it away," she stated."

In a prior recorded phone call, it appeared that the same male caller as before talked about the Freedom of Information Act.

In the same month, she faced disciplinary action for the first time in nearly a decade after talking to a filmmaker – Smith.

Smith and the filmmaker talked about conducting an interview and filming for a documentary and ways to monetize it.

The incident report details the crime committed by Smith, including the events leading up to and after it, such as the contents of the trunk of the car that went into the water and her plans to jump from a bridge while holding the boys, but one woke up.

According to SCDC policy, inmates in South Carolina are not permitted to conduct interviews over the phone or in person, but they are allowed to write letters.

Smith agreed to share her contacts with the filmmaker, including her former husband, in exchange for payment. The filmmaker made a deposit into Smith's account for "Calls and Canteen," as per the incident report, which kept the filmmaker's identity confidential.

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Smith lost her telephone, tablet and canteen privileges for 90 days.

"Inmates at SCDC are given tablets for correctional use, which can be used for monitored phone calls and electronic messages. These tablets are considered a privilege and the department will decide when and if inmate Smith will earn the opportunity to use them again, as previously stated by Shain."

On Oct. 25, 1994, Smith put her sons, 3-year-old Michael and 14-month-old Alexander, in the back seat of her car and drove it down a ramp into John D. Long Lake in Union, South Carolina.

At 22 years old, Smith witnessed the car filling with water in six minutes, which drowned her boys and sank the car to the bottom of the lake.

On July 22, 1995, Smith was convicted of murdering her two children. Despite prosecutors advocating for the death penalty, she was ultimately given a life sentence in prison.

On Nov. 20, the board unanimously decided to reject Smith's parole after she cried and showed emotion during her hearing on the jailhouse court feed.

"During the parole hearing, she stated, "I am aware that my actions were terrible...I regret putting them through that pain...If only I could go back and undo it, I truly wish I could...I was just scared of the consequences." She added, "Telling the people who loved them that they would never see them again was difficult...I know my apology is not enough...It's just words, but they come from my heart.""

The parole board denied Smith's release due to the severity of his crime and his history of institutional misbehavior.