(NBC News) Two people have been arrested after police recovered a body from a makeshift tomb in the backyard of an Austin, Texas home. Kristie Michelle Cardenas, 36, and Walker Ray Kaatz, 22, were charged with tampering with physical evidence in the case. Police say Kaatz and Cardenas lived at the home where the body was found, and the suspects may have had a relationship with the victim. She said Kaatz pointed out drag marks and told her they had bleached them, the affidavit said. The witness said she had been told the victim recently gotten out of jail and assaulted his ex-girlfriend.