A 92-year-old man was under arrest Thursday, accused of shooting and killing his son in his Old Town home, San Diego police said.
Richard Landis Peck has been booked into jail on suspicion of first-degree murder, San Diego police homicide investigators said.
Peck is accused of shooting and killing his son, 51-year-old Robert Landis Peck.
San Diego police were called to the Pecks' home on Juan Street by a neighbor who reported hearing a man calling for help.
The neighbor told police a man was saying that he had just shot his son.
Officers arrived at the home on Juan Street between Sunset Road and Heritage County Park and found the younger Peck dead inside.
The elder Peck was across the street at a neighbor's house when officers arrived.
Lt. Matt Dobbs told NBC 7 the suspect was questioned downtown while investigators at the scene interviewed neighbors.
Detectives announced the elder Peck would face first-degree murder charges Thursday afternoon.
Investigators are still trying to determine what prompted the shooting.
Neighbors told NBC 7 the elder Peck was once a successful lawyer in San Diego. They say these days he sometimes has to use a wheelchair.
Maureen Mongrain said the neighborhood is quiet and safe, and she couldn't believe what had happened.
"I felt really sad because I asked [an official] if it was in a house and she said yes. Then I knew it wasn't a drive-by shooting or something like that, I knew it was probably domestic and that's always sad," Mongrain said.
Police asked anyone with information about the incident to call them at (619) 531-2293 or Crime Stoppers at (888) 580-8477.