Police on Monday arrested the teenager sought in connection with the slaying of his 19-year-old roommate and girlfriend, who was found shot to death in their Pasadena home one night earlier.
Jonjon Crummie, 18, was taken into custody about 4 p.m., according to the Pasadena Police Department.
Officials announced Crummie as a person of interest Sunday night, hours after his girlfriend and roommate, 19-year-old Irais Acosta (pictured at right) was found shot to death in the home the two shared with Acosta's mother.
"He turned himself in with his mother into the LA County Sheriff's Department in Los Angeles," Pasadena Police Lt. John Dewar told NBC4. "They in turn contacted us, called us late this afternoon."
Crummie was arrested outside LA County USC Medical Center, but officials did not say why the arrest took place at the hospital.
Acosta's parents spoke to the Pasadena City College student on the phone less than an hour before the shooting to make plans to go to church.
Neighbors said they saw two men run away from the residence after hearing gunshots.
Friends, relatives and city officials mourned Acosta at a memorial in Pasadena Monday night.
"It's a very tragic situation," Pasadena Vice Mayor Jacque Robinson said. "This is the first homicide in Pasadena for the 2014 year, and you know, two lives were cut way too short."
Family members started a GoFundMe account to help raise money for Acosta's funeral. Anyone who wants to donate can visit the Irais Acosta Funeral Expenses GoFundMe page.
Crummie was booked on suspicion of murder and was being held in lieu of $1 million.
Note: NBC4 originally reported Crummie as 19 years old based on information given by Pasadena police, but it was later clarified that he is 18 years old.