Omar Pettigen of Fremont, California was found and arrested five days after his father, who lives in New Mexico, called police to do a welfare check on his ex-wife and son after not hearing from them.

When the police arrived at the home, they found 64-year-old Nailah Pettigen dead in her bedroom with her underwear around her ankles, and, according to police, “appeared to have been disemboweled.”

An autopsy revealed that Nailah, a former math teacher, had been sliced from her neck to her cervix, and had also been shot at least seven times.

Omar admitted what he’d done – and even went so far as to say to one investigator that he felt ‘good’ about what he’d done.

According to his version of events, he and his mother had argued and she pulled a gun on him. He claims he then grabbed a hammer to knock the gun from her hand.

Moments later, he left briefly and returned with a tomahawk and pummeled her before shooting her in the back with a gun of his own that he’d also retrieved.

He then sliced open her chest and removed her heart with his bare hands before then putting it back inside of her.

He told investigators that he then masturbated because “he needed to be with himself and needed a release after the event” and then went out drinking with friends.

Police say he stayed completely calm during questioning and showed zero signs of remorse.

His family says they had “seen a change in Omar since he’d returned from Morocco several months prior to the murder.”

He is now being held without bail on charges of murder and desecration of human remains.