Tulsa woman pleads guilty to evidence tampering in drug-related case

TULSA, Okla. — A 30-year-old Tulsa woman pleaded guilty in federal court Wednesday to tampering with evidence partially related to an investigation into her possession, use and distribution of controlled substances, according to U.S. Attorney Clint Johnson.

The federal investigation was launched following the death of Ashton Nikoel Mattingly’s two-month-old baby on Jan. 4, 2021.

Mattingly pleaded guilty to three counts of tampering with evidence by corruptly altering, destroying, mutilating and concealing records and other objects.

According to the plea agreement, Mattingly admitted to instructing an individual to remove a white pill bottle from her home and to change her Snapchat password so that the evidence couldn’t be accessed during the ongoing investigation. She also admitted to instructing another individual to falsely report her cell phone as stolen and to have her service provider disable it so that phone records couldn’t be used as evidence.

The FBI and Tulsa Police Department conducted the investigation.