The ex-boyfriend of a 16-year-old girl who died in front of her mother last week was arrested Tuesday on a charge of stabbing her to death.

The Los Angeles County Sheriff's Department arrested 17-year-old Rory Murga without incident after deputies spotted him under a railroad underpass in Pico Rivera, about 10 miles southeast of downtown Los Angeles.

They had been searching for him since Friday, when his ex-girlfriend was stabbed multiple times in the chest and back in her Pico Rivera home just after 3 a.m.

The girl, 16-year-old Elena Moore, died in front of her mother after sheriff's Lt. Eddie Hernandez said she repeatedly screamed Rory's name and collapsed.

Hernandez said the pair dated for a year before Elena broke up with Rory two weeks before she was killed.

Rory was being booked as a juvenile on a murder charge and held without bail, Hernandez said, adding that it will be up to the Los Angeles County Attorney's Office whether to charge him as an adult.

It's unclear whether Rory has an attorney.

In addition to Elena screaming his name, Hernandez said evidence at the crime scene also tied Rory to the home. A kitchen knife believed to be the weapon used in the attack also was recovered inside, he said.

He said detectives interviewed Rory after his arrest and that he made statements that will help them build their case.

Deputies aren't looking for anyone else in connection to the killing, Hernandez said.