A man was shot to death inside a Mission Viejo home and his roommate was arrested on suspicion of homicide Tuesday, authorities said.

Orange County sheriff’s deputies were called to the 27000 block of Ruisenor in a neighborhood of single-family homes and evacuated the home, sheriff’s officials said.

The victim, identified as Noah Christian Aguilar, 22, of Mission Viejo, was found dead of a gunshot wound inside, sheriff’s spokeswoman Carrie Braun said.

The man who had been detained and arrested was Aguilar’s roommate, 22-year-old Michael Guy Levy, Braun said.

Video from OC Hawk showed deputies stationed on the street while a man and woman exited the home with deputies placing the man in handcuffs.

The firearm believed to have been used during the shooting was collected at the house, Braun said.

What led up to the shooting was not known. Where the victim was found inside the house was not disclosed.