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HOUSTON -- Surveillance video captured something unforgettable last week.

The images showed a carjacker attacking, stabbing and killing Tina Davila.

She was laid to rest Monday.

Police say the man responsible for Davila’s murder is 22-year-old Timoteo Rios.

On Monday, authorities confirmed that Rios was involved in a fourth carjacking over two days this month.

The last incident happened just hours after Davila was killed.

Investigators believe Rios is an illegal immigrant who may have fled to Mexico.

That news comes as no surprise to groups fighting illegal immigration.

Bob Price works with U.S. Borderwatch.

“This man spent 40 days in jail last year.  Was identified as being an illegal alien. Somewhere there is a breakdown in the system,” he said.

It's a breakdown Price says must be fixed. 

“As we see with Rios, he was in jail twice last year.  If they gotten him out the first time, he wouldn’t have been there the second time,” he said.

Harris County SO

Timoteo Rios has been charged with the murder of Tina Davila.

Rios served time last year in the Harris County Jail on misdemeanor charges related to drugs, criminal mischief and giving a false name.

At this time, it is still unclear why a detainer hold wasn’t placed on Rios.

ICE officials are looking into that, but it’s also raised the larger question.

Now many want to know if more needs to be done to track illegal immigrants who commit crimes.

Immigration attorney Harry Gee says hardened criminals should be priority one. 

He says raids like the one at a Shipley’s donuts factory last week only target hard-working people.

“I think the utilization of those resources be refocused on criminal, smugglers and lawbreakers,” said Gee.

As more crimes involving illegal immigrants make headlines, law enforcement could face even more pressure on a divisive issue.