A man who fled to Mexico after allegedly stabbing his ex-girlfriend's new boyfriend to death in California has finally been nabbed after eight years on the run, according to authorities. 

Humberto Rodriguez Martinez, 39, was extradited to Orange County on December 4 after Mexican authorities and the US Marshals Service located him, prosecutors said on Friday. 

The former fugitive was wanted for murdering Daniel Reyes, his ex-partner's 32-year-old boyfriend, on October 17, 2017. 

According to law enforcement, Martinez, then 30, and his friend Adan Zapot-Leyva, 28, went to his ex-girlfriend's apartment in Anaheim to watch his two children, whom he shares with her, while she went to work. 

Martinez, a Mexican citizen who was in the US illegally at the time of the murder, and his ex had been broken up for several months but co-parented their children, prosecutors noted. 

Both Martinez and Zapot-Leyva left his ex-girlfriend's apartment around 8.30pm that day after she returned home from her job. About 30 minutes later, Reyes arrived at the home.

The following morning, officers with the Anaheim Police Department responded to a nearby intersection after witnesses reported two men chasing Reyes down and one of them stabbing him. 

Reyes, who was stabbed 10 times, was pronounced dead at the scene. 

Humberto Rodriguez Martinez, 39, was taken into custody by US officials in California after he was discovered in Mexico years after he allegedly stabbed his ex-girlfriend's new boyfriend to death in Anaheim

Zapot-Leyva later admitted to participating in the killing and pleaded guilty to one count of second-degree murder in 2023. He was sentenced to 15 years to life. 

Police charged Martinez with murder as well, but he had already made a run for it. 

His car was found in San Diego, and a $2 million warrant was issued for his arrest. 

After years of managing to stay under the radar, authorities were able to track him down last month and get him shipped back to the US. 

Once he touched down at Los Angeles International Airport, homicide detectives with the Anaheim Police Department took Martinez into custody. 

The alleged murderer was seen stern-faced in an all white outfit and tan jacket while several officers escorted him. 

Martinez pleaded not guilty to murder on Tuesday and is currently being held without bail. 

As part of his plea deal, Zapot-Leyva told authorities that he and Martinez had staked out the apartment for hours beforehand because they knew Reyes would be in there, the agreement obtained by City News Service stated. 

Martinez (pictured) allegedly carried out the murder with his friend Adan Zapot-Leyva, who pleaded guilty in 2023