Three Pittsburgh, Pennsylvania, police officers were shot to death while responding to a 911 call of a domestic argument triggered by a urinating dog, according to a criminal complaint filed in the case.

Police said following the shootings Saturday that Richard Poplawski, 22, would be charged with three counts of homicide, aggravated assault and other charges. Poplawski, who was shot in the leg during a four-hour standoff with police, was hospitalized at an undisclosed location, police said.

Details of the incident were included in the police complaint seeking an arrest warrant for Poplawski. The complaint says Margaret Poplawski called 911 about 7 a.m. Saturday to report that her son was "giving her a hard time." Watch officers respond at the scene »

She told police she awoke to discover that "the dog had urinated on the floor," and awakened her son "to confront him about it."

The two had an argument, and Margaret Poplawski told her son she was calling police to remove him from her home, according to the complaint. When officers Stephen Mayhle and Paul Sciullo III arrived, she opened the door and let them in.

"Mrs. Poplawski reported that as the officers entered approximately 10 feet into the residence, she heard gunshots, turned and saw her son about six feet away with a long rifle in his hands, at which point she fled downstairs after asking him, 'What the hell have you done?'" the complaint said.

Margaret Poplawski reported she stayed in the basement during the standoff, and heard her son yell, "Yeah, I've been shot," and "I'm standing down, come in and help me," according to the complaint.

Police Chief Nathan Harper identified the dead officers as Eric Kelly, Mayhle and Sciullo. Kelly was a 14-year veteran of the department; the other two had worked there for two years each