Yang's parents called him after the death, Nam said, but couldn't even utter the words to explain what happened. "They were only crying," Nam said. "I pray for him."
A woman who answered multiple phone calls to Yang's family's home told ABCNews.com that she did not speak English and hung up the phone each time.
Yang's funeral will take place in the Bronx on Monday.
Bronx Borough President Diaz said in a statement, "My heart goes out to Hwang Yang's family as we keep them in our prayers. It is extremely disappointing to see such senseless, cowardly acts being committed in our borough."
He added, "I urge all Bronxites with knowledge of illegal guns in their community to call 866-GUN-STOP to anonymously report those guns to the police."