(PHILADELPHIA) -- One of the teen suspects in the fatal shooting of a Penn State University student was arrested in Colorado after the Philadelphia Police Department said it had obtained arrest warrants for two 16-year-old boys.

Azzubair Outen-Fleming was arrested in Colorado Springs at a distant relative's home, the U.S. Marshals Service of Philadelphia said in a social media post.

Outen-Fleming and Kaiseem Smith are wanted for murder and related offenses for the June 6 slaying of 22-year-old William "Billy" Schmidt, police announced on Tuesday.

Billy Schmidt had been watching the NBA Finals with his friends at a bar and was walking home when he was shot in the chest in an apparent robbery, according to police and his family.

Schmidt was studying digital journalism and media at Penn State World Campus, the university said.

He was set to graduate in December and hoped to work in sports broadcasting, his sister, Anna Schmidt, told ABC News.

She said her brother "was one of the nicest, most genuine and honestly, goofiest, people there is."

Outen-Fleming was arrested by the U.S. Marshals' Colorado Violent Offender Task Force, officials said.

"He was arrested at a distant relatives home after attempting to deny his identity," the U.S. Marshals of Philadelphia said. "He is housed at the Zebulon Pike Youth Center waiting extradition back to" Philadelphia.

Police ask anyone with information on the suspects' whereabouts to call the department's tip line at 215-686-TIPS (8477).

ABC News' Jessica Gorman contributed to this report.

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