CNN —  

A Houston police officer will “more than likely be charged with a serious crime” after lying in a search warrant for a January 28 drug raid in which two people were killed and five officers injured, the Houston police chief said.

Officer Gerald Goines obtained a search warrant by using an unnamed confidential informant to confirm that drugs were being sold in the home police raided, according to affidavits obtained by CNN. The affidavits, dated February 14, detail the investigation after the raid.

Following the raid, Goines named his informants to investigators, but the informants told authorities they had not worked with Goines on this particular case, according to affidavits.

Those informants told authorities they had worked with the officer “in the past on several narcotics transactions,” but not for the warrant at the Harding Street address, according to the affidavits.

“It appears there are some material untruths and lies,” Acevedo said. “No matter what we end up with here we know we have a criminal violation already – and serious criminal violation – by the individual that prepared that affidavit.”

Nicole DeBorde, Goines’ attorney, told CNN on Monday her client’s jaw is wired shut and he continues to undergo medical treatment.

“No matter what we end up with here we know we have a criminal violation already – and serious criminal violation – by the individual that prepared that affidavit,” Acevedo said in a Friday press conference.

“When we prepare a document to go into somebody’s home … it has to be truthful, it has to be honest, it has to be absolutely factual,” he said, adding that there’s a “high probability there will be a criminal charge.”

The police chief said the extent of the crime and the policies that were violated are still being investigated.

When narcotics officers breached the front door of the home on the evening of January 28, gunfire erupted almost immediately.

One of the suspects retreated to the back of a room and re-emerged, returning fire, police said. The second was shot while trying to wrestle a shotgun away from an officer, they said. Both suspects were killed.

Four undercover narcotics officers were shot, police said. A fifth officer suffered a knee injury.

Investigators discovered no heroin in the raid despite having said they previously purchased the black tar form of the drug at the home. Officers did find marijuana, five guns and a white powder believed to be cocaine or the painkiller fentanyl, Acevedo said after the raid.

Goines will be relieved of duty when released from the hospital, according to Acevedo.

CNN’s Eliott C. McLaughlin, Jason Morris and Darran Simon contributed to this report.