MONTGOMERY, Ala. (AP) — The number of people arrested in a multi-state dog fighting investigation has grown to 13.

Federal court records show Jennifer Hayden McDonald, of Fairburn, Ga., was arrested last week in southern Mississippi on a conspiracy charge. She has not been scheduled for arraignment in Montgomery.

Court records say federal agents saw three people loading a dog into a sports utility vehicle following a dog fight in Lee County, Ala., on April 7, 2012. The agents followed the vehicle into Georgia. The Georgia Highway Patrol stopped the SUV for a traffic violation and found a dead pit bull inside. Authorities say McDonald and co-defendant Carlton Tippens were in the SUV. A vet examined the animal and found severe wounds consistent with staged dog fighting.

Tippens and 11 others were arrested in late August.