'Person of interest' in Tucson police recruit’s killing tied to drug ring

For Tucson residents, the arrest of Alexis Monter adds a significant development to the investigation into the shooting death of Carlos Ramirez, a Tucson police recruit who was killed inside his home in August. Monter is not charged in Ramirez’s death, but the Pima County Sheriff’s Department considers him a person of interest because he was believed to be the last registered owner of an Acura MDX connected to the shooting. Monter now faces federal allegations involving fentanyl and is described in court records as allegedly tied to a Mexico-based, large-scale criminal organization.

Monter, 30, was arrested Aug. 30 while attempting to enter the United States through the Douglas Port of Entry. A U.S. Customs and Border Protection officer found that he was wanted by the U.S. Marshals Service and that an active arrest warrant had been issued. The warrant came from a separate federal investigation based in Phoenix, not from a criminal charge in Ramirez’s killing. Monter has since been federally indicted on charges of conspiracy to distribute fentanyl and distribution of fentanyl.

That federal investigation began in early July, after Homeland Security Investigations received information about a drug trafficking organization operating between Mexico and the United States. According to a memorandum filed in federal court, an undercover HSI agent contacted a drug source and arranged to buy approximately 10,000 fentanyl pills for $4,000 in Phoenix. The source said a courier would reach out to arrange the transaction.

On July 8, shortly before 7 p.m., the courier contacted the undercover agent through WhatsApp. About 40 minutes later, the agent met two people in a white Mazda CX-5. After the participants argued over the terms of the sale, the passenger handed the agent a grocery sack containing blue pills, and the agent gave the pair the money. Investigators traced the phone number used to arrange the meeting to Monter, and the undercover agent identified Monter as the passenger who delivered the pills.

Records also showed that Monter had entered the United States through the Douglas port in a gray Acura MDX the day before the planned fentanyl sale. That vehicle later became part of the investigation into Ramirez’s killing. Ramirez was found dead Aug. 19 inside his home in a residential area near West Valencia Road and South Camino Verde. The Sheriff’s Department issued an alert for an SUV believed to have been involved, and investigators determined that the Acura associated with Monter matched the description. The vehicle was located on Tucson’s southeast side the next day.

Ramirez, a former Pima County corrections officer, was about a week from completing the academy and joining the Tucson Police Department. According to an interim complaint filed in Pima County Justice Court, he was shot while struggling with two masked intruders. His pregnant fiancée, a 23-year-old corrections officer, was shot in the shoulder during the incident. Their child was also inside the home. The circumstances have left investigators with limited publicly released information about why the house was targeted and who planned the attack.

The investigation into Monter’s whereabouts continued after the Acura was found. On Aug. 21, investigators went to his mother’s home and spoke with her by telephone when she was not there. The next day, a deputy U.S. marshal received a call from someone identifying himself as Monter. The caller reportedly said he had heard authorities were looking for him and insisted he was not in trouble for the homicide. When asked about the Acura, he said he had sold it and promised to provide an address where investigators could meet him. He did not call back. Eight days later, he was detained at the Douglas port while trying to come into the country.

Two other men were arrested in the days after the shooting. Santiago Rogers, 39, was taken into custody without incident at a hotel on Tucson’s south side. Alex Barnett, 34, surrendered Aug. 24 after a five-day manhunt and a three-hour standoff. Authorities also located a third man they suspected of involvement, but the Sheriff’s Department said he was not arrested. Court records indicate that neither Rogers nor Barnett had a known connection to Ramirez or his fiancée.

Pima County Sheriff Chris Nanos has said publicly that he believes the shooting was an attempted drug robbery that targeted the wrong home. In his account, people involved in a drug deal were trying to rob someone, but went to the wrong address. Nanos said there was no evidence suggesting Ramirez or his family had another connection to the attack. Monter’s federal drug case may provide investigators with additional information about the drug network and the Acura’s movements, but the available records do not establish that Monter took part in Ramirez’s killing. The homicide investigation remains separate from the federal prosecution, and authorities have not announced further charges against Monter in the Tucson shooting.