A 14-year-old boy who was charged earlier this week with killing his pregnant mother has confessed to the crime, investigators said on Thursday.

Read: 14-Year-Old Son Charged With Murdering His Pregnant Mother at Their Home

The teen said he stabbed and strangled his mom, 33-year-old Nita Moseley, more than 20 times when he attacked her at their home outside Houston, according to The Associated Press.

An autopsy performed on Wednesday showed that most of the stab wounds were to her back and neck. She was about five months pregnant.

"The son did provide a voluntary statement in which he confessed to causing the death of his mother,” investigators said in a statement, although they didn’t indicated a motive.

Child welfare authorities said the boy and a younger sibling had been removed twice from her custody because of her substance abuse and her partner's domestic violence.

The teenager's father also defended him to local reporters after Moseley's death, calling him "a good kid who was dealt a bad deck of cards."

The unidentified man told KPRC: "This is a story that will let people know that families need to stick together. When they don't, this is the kind of thing that takes place."

Read: Newborn With Umbilical Cord Still Attached Is Found Dead Behind Apartment Building

The boy was charged with a juvenile count of murder and is currently being held at a juvenile detention facility.

He was initially reported missing, but was discovered a day later in Houston when a member of his family called police.

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