The Latest on investigation into deadly police raid on Houston home (all times local):

3:15 p.m.

Police Chief Art Acevedo says an internal review must be conducted of his department's narcotics division after it was determined that a narcotics investigator lied in an affidavit justifying a drug raid that led to a deadly gun battle.

He said Friday that authorities must determine whether other cases involving the investigator may be compromised based on his actions shortly before the Jan. 28 raid in which two residents of the home were killed.

Acevedo says, "We will report back the good, the bad and the ugly."

Acevedo and police records reveal that the investigator claimed heroin had been purchased from the residents when the drug the investigator had in his possession was actually obtained elsewhere.

Authorities still believe the residents were involved in criminal activity, but Acevedo says the case now is undermined.

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2:50 p.m.

Houston's police chief says a lead investigator lied in an affidavit justifying a drug raid on a home in which two residents were killed and four officers were wounded during a gun battle.

Chief Art Acevedo said during a news conference Friday that the investigator falsely claimed in the affidavit that an informant obtained heroin from the home. Police records indicate it was actually obtained elsewhere.

The investigator was one of the officers who were shot in the gunfight Jan. 28 that killed 59-year-old Dennis Tuttle and 58-year-old Rhogena Nicholas. He remained hospitalized Friday.

Acevedo praised the investigator in the hours after the raid as being "tough as nails," but he said Friday that there's a "high probability that there will be a criminal charge" brought against him.