A convicted felon on the FBI's 10 Most Wanted Fugitives list accused of killing his pregnant girlfriend and her unborn baby in Los Angeles last month has been captured, according to FBI officials.

Philip Patrick Policarpio was apprehended Sunday by agents with the U.S. Customs Border Protection, FBI spokeswoman Laura Eimiller confirmed. Policarpio was taken into custody at the San Ysidro Port of Entry as he was crossing into the United States from Tijuana, Eimiller said.

The FBI said Policarpio and his 32-year-old girlfriend, Lauren Olguin, were visiting a friend's home in the Rampart area April 12 when the crime was committed.

Policarpio had allegedly become angry and beat Olguin in the face with his fists before pulling out a handgun and shooting her in the forehead, the FBI said.

It's unclear if he knew Olguin was 17 weeks pregnant at the time.

Olguin died instantly and Policarpio went on the run, the FBI said.

Olguin mother's, Jerilyn Olguin, said she was relieved to find out her daughter's suspected killer was in custody.

"Although my daughter's gone, my biggest fear was, 'God, I hope he doesn't do this to someone else,'" Olguin said.

"I thought maybe we could be waiting for years, who knows? Maybe never," she said.

At the time of the incident, was on parole for a 2001 conviction. In that prior case, Policarpio fled to the Philippines after he was suspected of firing nine shots into another car over a dispute in Burbank in 2000. He was deported to the U.S. the following year and was convicted and sentenced to 14 years in prison. He was released on parole in May 2015.

Policarpio has ties to Las Vegas, Florida and the Philippines, where, according to investigators, the 39-year-old has family members — including multiple wives and children.

Investigators said Policarpio's aliases include Damon Hiromi Tanaka, Paul Policarpio, "Bugsy," "Sinister" and "Sins."

The FBI added Policarpio to its most wanted list earlier this month. The list has featured 508 people since it was established in 1950, leading to the arrests of 475 fugitives.

Policarpio is expected to be arraigned this week.

"My daughter's not coming back but it does like a weight's lifted, like there is some closure," Olguin said.

Jaime Bankson and Kate Larsen contributed to this report.