Victim and alleged offender were living at home for mentally ill patients.

1:42 p.m.:

Andres Eligeo Ortega, 27, was booked into the Metropolitan Detention Center at 11:11 a.m. on an open count of murder and a felony evidence tampering charge after he allegedly killed Samuel Whitehorse, 45, authorities said.

The two men had been living together at a home for mentally ill patients in the South Valley, authorities said. 

Ortega told Bernalillo County Sheriff's deputies that his imaginary friend "Steve" told him to kill Whitehorse because Whitehorse "is a warlock," according to an arrest warrant affidavit.

Bernalillo County Sheriff's deputies have arrested a man on suspicion of fatally stabbing a fellow male resident early this morning at a home for mental illness on Camino Cinco SW, sheriff's spokeswoman Erin Kinnard Thompson tells ABQJournal.com.

Andres Eligeo Ortega, 27, is charged with an open count of murder and evidence tampering in the death of Samuel Whitehorse, who was his roommate at 211 Camino Cinco SW, according to an arrest warrant affidavit.

Whitehorse, who was in his 40s, was found dead inside a bath tub at the residence around 1 a.m., the affidavit says.

While speaking in "rapid tangents," Oretga told deputies he was an FBI agent and a police officer, then said: "I got him good, I stabbed him in the stomach," the affidavit reads.

 Ortega's bond was set at $1 million cash or surety, but he had not yet been booked into the Metropolitan Detention Center as of 11 a.m., court and jail records indicate.