Both suspects were expected to be arraigned Thursday afternoon on one count of murder each, with special circumstance allegations of murder during the commission of a robbery, according to the Los Angeles Country District Attorney's office.
The West Covina Police Department identified them as Elijah Thomas Rouse, 18, and Shaun Cardarelli, 37. Three people were also detained after a West Covina SWAT team descended on a home in La Verne on Tuesday morning. It's not clear if the suspects who were booked were among those detained.
Detectives believe this case may be connected to a burned body that was discovered in Upland last week, but authorities have yet to determine if the body is that of the alleged victim, John Brian Mananghaya Aguila, who had not been heard from since Aug. 22.
Family members contacted police over the weekend and reported that the 28-year-old had not showed up to work or returned home, adding that such conduct was uncharacteristic of him.
Investigators later learned that Aguila's white 2017 Honda Civic had been discovered in San Dimas on Friday and impounded. Surveillance video shows "a male leaving from the car and walking away from it," police said in a statement, but it was determined that the individual was not Aguila.
Authorities said gloves and clothing with blood on it were found in the trunk of the Civic, and evidence collected helped investigators identify the male seen in the video.
Authorities then served a search warrant at a home in 1400 block of Third Street where the three people were detained.
VIDEO: 3 detained in La Verne after gloves, bloody clothing found in trunk in West Covina missing person case
Police aren't sure if Aguila is still alive.
Rouse and Cardarelli are being held without bail. Their connection to Aguila is unclear.
If convicted as charged, the defendants could face the death penalty or life in prison without the possibility of parole. Prosecutors have not yet decided whether to seek capital punishment, according to the DA's office.
Anyone with information about Aguila's whereabouts is asked to call West Covina police at (626) 939-8557. Anonymous tips can be left on a recorded line at (626) 939-8688.