People who live near this property in the unincorporated area of El Cajon have seen sheriff's deputies here before, saying it's known for loud parties and fights.
"Loud music and then a sheriff car would show up... It would be some sort of verbal altercation, and a sheriff car would show up," one neighbor said.
One man, who goes by the name Warren, has lived up the street for four years.
He and others awoke to the sound of sirens early Sunday morning following a shooting that killed 35-year-old Eufracio Alberto Enriquez and left his girlfriend, 39-year-old Leila Farmer, with a gunshot wound to the arm.
The suspect has been identified as Farmer's ex-boyfriend, 50-year-old Abel Martinez.
"Mr. Enriquez and Ms. Farmer were in bed asleep. They woke up to find Martinez, and some words were exchanged. He produced a handgun...first shot Mr. Enriquez and then shot Ms. Farmer," sheriff's Lt. Glenn Giannantonio said.
Farmer reportedly called 911, as family members, who live in another house on the property intervened.
"When the deputies arrived, family members were conducting CPR on Mr. Enriquez. The deputies took over CPR until they were relieved by paramedics," Lt. Giannantonio said.
Enriquez died at the scene.
Several hours later, Martinez was dropped off at an Alpine substation by an unknown person, where he turned himself in.
"We do know there was a relationship between himself and Ms. Farmer...we're not sure if it's related to what the motive would be," Lt. Giannantonio said.
Family members stood by as investigators collected evidence.
They did not want to comment on the shooting, which marks the third homicide in the El Cajon/Alpine area in less than two weeks.
"We have been very busy, especially in this general area, which is unusual for this area," Lt. Giannantonio said.
Martinez faces charges of murder and attempted murder. No word yet on when he will be arraigned.