Investigation Discovery’s Fatal Family Secrets revolves around the assassination of Gloria Marmolejo. Her son, David, was finally convicted based on the phone records and also because of a witness. Now, you might be wondering that who had testified against him? Well, it turns out that his accomplice had betrayed him in return for her immunity.
Who is this accomplice of David? Well, the name of the accomplice is Mariah Wilson. She is the one who had testified against David. Later on, it turns out that she is not just his stepsister, but they were also in a relationship. How did he know her? Keep reading the article to find all these answers.
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ToggleWho is Mariah Wilson?

After Bene and Gloria got separated, he started to live permanently in Arizona. Bene got remarried, and he married had a daughter named Mariah Wilson. During that time, David was residing with his wife and children at Phoenix. As it was shown in the show that David and Laura used to look after Mariah. It was then only when Laura realized that something is eerie.
She even confessed that it was always like something is kind of off, but she just couldn’t accept the way she thought of these things. The reason was Mariah was a teen, and they always treated her like their own daughter. Further, Mariah explained the overall plan of David and what was their exact relationship status.
She even confessed that the time they started to know each other, she was merely 11 years old. Then things happened between them, and at the age of 15, Mariah got pregnant. After that, she doesn’t have any other options and puts the child on adoption.
What Happened to Gloria Marmolejo?
She even explained how David even thought of the murder as being looked like abduction, and then things happened after that. It was July 25, 2009, when both Mariah and David decided to go for a movie and his mother came back home. When both of them returned home after the movies, it was then that David explained to Mariah about his whole plan. It was what Mariah testified against David.
Where was the Body of Gloria Marmolejo Dumped?

She even confessed that David had punched his mother, and after that, he completely blacked out. When he regains his consciousness, he realizes that he has killed his mother as the belt was wrapped around her neck. She even admitted that she helped him to clean up and hide the body. Later on, the body was disposed of behind a school. The school is located in Santa Teresa, New Mexico.
Where is Mariah Wilson Now?
Mariah was asked to testify only during the first trial. But, eventually, the first trial ended as a mistrial. The second trial was completely based on phone records, and she was not asked to testify any further. Later on, David was sentenced because he murdered his mother. As far as Mariah is concerned, currently, she is working as a teacher in one of the preschools in Arizona itself.