Tusan, 22, was killed on Sunday at a Denton, Texas, apartment complex. Denton police say five people were involved in some sort of altercation during the home-invasion robbery.
"He was a good kid," Clarence Nevels, a former coach and mentor to Tusan, told the Denton Record-Chronicle. "He had good grades and was just down at AT&T Stadium for Thanksgiving Day Madness Youth Football speaking to students about believing in themselves."
Tusan, who was at home on holiday break from the Washington D.C., school, was killed along with 18-year-old Jakobi Dmon Gipson.
Police say three men forced their way into an apartment and gunfire broke out, leaving two suspects dead and two residents wounded. The third suspect fled and reportedly remains at large.
Nevels, who said he knew Tusan for 15 years, told the Denton newspaper that Tusan didn't have a criminal history and wasn't known to be associated with drugs.
"You have to wonder, what would be the purpose to throw his life away?" Nevels said, according to the Record-Chronicle's report.
Tusan, a junior for Howard, had 331 rushing yards with two touchdowns this season as a backup running back, including a 70-yard TD in a 38-25 loss to Rutgers.
Police recovered two guns, one belonging to a victim and another belonging to a suspect. Police haven't specified who opened fire.
"Terrence was the only child [his mother, Donna Tusan] had left, and now he is gone, too," said Nevels, who the newspaper reported was speaking on behalf of the Tusan family. "We just want to ask anyone looking into this incident to investigate further."
Information from The Associated Press was used in this report.