Las Vegas man who killed 4 in Manhattan was a high school football player in Southern California

The man who fatally shot four people at a New York City office tower Monday, including an off-duty police officer, and wounded a fifth before taking his own life, was identified as a Las Vegas resident.

Police identified the gunman as Shane Tamura, 27, and said he killed himself. He had a “documented mental health history,” but the motive is still unknown, police Commissioner Jessica Tisch said.

In Southern California, news reports said Tamura played football a decade ago at Golden Valley High School in Santa Clarita before transferring to and playing at Granada Hills High School in the San Fernando Valley.

In a Sept. 18, 2015 game in which Granada Hills defeated Kennedy High School, Tamura, a tailback, scored the winning touchdown and was interviewed by the Los Angeles Daily News.

It was not immediately known when Tamura moved out of Southern California or when he moved to Las Vegas.

Former high school teammate Caleb Clarke told NBC News that Tamura shared that he had been working at a casino in Las Vegas.