Tania Santos is an antagonist from "The Formula", episode 6.15 of CSI: NY.
She was portrayed by Marisa Ramirez, who also played Astaroth in Supernatural.
Tania Santos is the wife of legendary race car driver Davi Santos, but it was later revealed that Tania was having an affair with fellow racer (and Davi's good friend) Dwight Bernard, as she was shown at a hotel embracing Dwight. She was angry at Davi for reneging on his promise to retire, and displayed her same anger at Dwight for not convincing Davi to hang it up. With that, the evil Tania colluded with Dwight to tamper with the engine in Davi's car, doing so in the hopes that an injury would force Davi into quitting. Davi ended up killed, and Tania was at her husband's bedside as he flatlined.
The video of Tania with Dwight ended up revealing Tania as an adulteress and a villainess, and both parties were separately interrogated for their role in the sabotage. Tania stated to Stella Bonasera that their intent was not to kill Davi, and following their interrogation, it was determined that Tania and Dwight's actions did not kill Davi, as it was Conner Wells who actually killed him. Even so, Tania was eventually arrested for her villainous actions, as was Dwight.