Solomon Peña Cheered Trump on Jan. 6. Now He’s Accused of Targeting Democrats.

Ms. Barboa, the county commissioner whose home was targeted in the first attack, said in an interview that Mr. Peña had come to her home after the election to argue that it had been fraudulent. “He was aggressive and seemed to be acting erratic,” she recalled. “He claimed there was no way he could have lost, even though he lost in a landslide.”

Ms. Barboa said that Mr. Peña seemed to have visited her home, as well as that of Ms. O’Malley, who was also targeted in the shootings, because the Bernalillo County Board of Commissioners certifies election results. The visit to Ms. Barboa’s home took place before the commission certified the results, she said. (Mr. Peña ran against another Democrat, Miguel Garcia, who does not appear to have been the subject of an attack.)

Video surveillance from Ms. O’Malley’s home later showed Mr. Peña driving by in a black 2022 Audi — the same car that a witness saw speeding away from the area around Ms. O’Malley’s home when it was targeted on Dec. 11, the criminal complaint said.

According to a confidential witness cited by the police in the complaint, Mr. Peña was not pleased that the first shooting attacks against Democratic officials were carried out late at night, when the politicians and their families might have already been sleeping, and that the shots were fired high up on the walls of some homes.

“Solomon wanted the shootings to be more aggressive,” the witness told investigators, according to the complaint. In the last attack, on the home of Ms. Lopez on Jan. 3, the witness said that Mr. Peña and two gunmen he hired got into a stolen red truck and drove there.

Mr. Peña was armed with an AR-15, but the gun seems to have jammed and did not fire correctly, according to the complaint. But other shots fired from the vehicle struck Ms. Lopez’s home, including the room where her daughter was sleeping.

Shortly after the attack, police officers arrested Jose Trujillo, 21, at a traffic stop and found that shell casings at Ms. Lopez’s home matched a handgun confiscated from Mr. Trujillo, according to investigators. Officers detained Mr. Trujillo on an unrelated felony warrant and found that he was driving a car owned by Mr. Peña, the police said, adding that they also found a large amount of cash, more than 800 pills believed to be fentanyl and numerous firearms in the car.

Chief Medina said Mr. Peña could face more charges as the police continued their investigation. “We continue to peel off layers, like an onion,” he said.

Kirsten Noyes contributed research.