A Los Angeles County Sheriff's deputy has been arrested and charged in the shooting death of a Sylmar resident, Los Angeles police detectives said

Deputy Francisco Gamez, 41, was booked on suspicion of murder, attempted murder, and the used of a firearm during the commission of a felony. He remains in custody in lieu of $4 million bail at the 77th Street Jail.

Detectives said Gamez is charged in the shooting death of Armando Casillas, which occurred on June 17.

That morning, at approximately 11:15 a.m., Mission Area patrol officers were flagged down by citizens in the 14000 block of Beaver Street in Sylmar. The officers were directed to Casillas, 38, who was suffering from a gunshot wound. Casillas was transported to Providence Holy Cross Hospital, where he was pronounced dead.

A second victim, who was shot at by the assailant at the time of the homicide, was not injured.

Mission Homicide detectives initially investigated the murder and developed leads that possibly connected a deputy sheriff to the crime. As the case progressed, Robbery Homicide Division assumed primary investigative responsibility because the suspect was a possible deputy sheriff. Gamez was arrested without incident on Nov.14 by the Robbery Homicide Division detectives, working in partnership with the Mission Homicide detectives.

The investigators are preparing the case for filing with the District Attorney's Office.

Anyone with information about this investigation is urged to call Robbery Homicide Division, Detectives Louis Zorrilla or Maria Perez at (213) 486-6890. During non-business hours or on weekends, calls should be directed to (877) LAPD-24-7 (877-527-3247). Anyone wishing to remain anonymous should call Crime Stoppers at (800) 222-TIPS (800-222-8477). Tipsters may also contact Crime Stoppers by texting to phone number 274637 (C-R-I-M-ES on most keypads) with a cell phone. All text messages should begin with the letters "LAPD." Tipsters may also go to www.lapdonline.org , and click on "Anonymous Web Tips."