The Pinellas County Sheriff’s Office is investigating to learn the identity of the person and said the gator was "humanely killed."

A 13-foot alligator was spotted with human remains in its mouth in a canal in unincorporated Largo, Florida.

Jamarcus Bullard said he saw the alligator and a body in the water on 134th Avenue North on Friday afternoon.

“I threw a rock at the gator just to see if it was really a gator and like it pulled the body, like it was holding on to the lower part of the torso, and pulled it under the water,” he told NBC affiliate WFLA of Tampa.

Stunned, Bullard said he started recording on his cell phone and contacted authorities. A video he shared with the news station showed an officer with the Florida Fish and Wildlife Conservation Commission measuring the massive animal.