In a new jailhouse interview, Chris Watts, the Colorado husband and father who pleaded guilty to killing his pregnant wife, Shan'ann, and two young daughters, has allegedly made a horrifying confession.

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Dr. Phil exclusively reveals the details Shan’ann’s parents, Sandy and Frank Rzucek, say are on the tape, on Tuesday’s episode. Hear what the Rzuceks’ legal team says Watts confessed about what really happened in his wife and daughters’ final moments – and what his oldest daughter, Bella, allegedly said to him when she walked in and saw her mom wrapped in a sheet.

WATCH: Chris Watts: From Grieving Father And Husband To Convicted Of Murdering Pregnant Wife And Two Daughters

On Tuesday, hear more details from Watts’ five-plus hour confession, exclusively on Dr. Phil. And on Monday, Dr. Phil has an exclusive interview with Shan’ann’s parents along with her brother. Hear their first reaction to Watts’ new confession. Check here to see where you can watch.

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'Shan'ann Was A Good And Loving Mother, Had Not One Thing To Do With This,' Dr. Phil Says Of Woman Whose Husband Killed Her And Their Daughters