A woman was fatally shot and her boyfriend wounded by a gunman who reportedly took issue with how the couple told their dog to poop during a walk in Denver on Wednesday.

The victims — identified in reports as Isabella Thallas, 21, and Darian Simon — were walking their pooch near Coors Field when 36-year-old suspect Michael Close quarreled with them from inside his apartment, the Denver Post reported.

"The suspect got into a verbal altercation with the victims related to the victims telling the dog to poop," according to a probable cause statement obtained by the newspaper.

Close reportedly asked the couple if they were going to train their pooch or just yell at it, the police records state.

Simon told police he tried to ignore Close before shots rang out, striking him twice and killing his girlfriend.

Police caught Close later Wednesday as he was driving on a nearby highway, the report said. A rifle and a handgun were found in his car, cops said.