Who is David Katz, the Jacksonville mass shooter?

Federal authorities were at a home near in Baltimore's Inner Harbor on Sunday night as part of an investigation into the Jacksonville mass shooting. (Kenneth K. Lam, Baltimore Sun video)

Authorities in Jacksonville, Fla., have identified a Baltimore man as the perpetrator of a mass shooting Sunday during a video game tournament.

“The single suspect in this case is a white male,” Jacksonville Sheriff Mike Williams said at a news conference Sunday night. “We believe the suspect to be 24-year-old David Katz of Baltimore, Maryland.”


Katz is believed to have opened fire during a “Madden 19” qualifying tournament at a Chicago Pizza around 1:30 p.m. He killed two people and left 11 others wounded before killing himself.

Here’s what we know about Katz:

» No motive is known. The Los Angeles Times reported that Katz had been eliminated from the tournament before he began his rampage.

» Local FBI and ATF officials are assisting the Jacksonville sheriff’s office with the investigation. They were a home tied to Katz in the 1200 block of Harbor Island Walk near Baltimore’s Inner Harbor on Sunday night.

» Katz was a 2011 graduate of Hammond High School in Howard County. He also attended the University of Maryland previously, but was not a enrolled this semester, university President Wallace Loh said. He enrolled beginning in September 2014, and majored in environmental science and technology, a university spokeswoman said. He did not live on campus.

» People in the online gaming community said Katz had played under the game tag “RavensChamp” and “Bread.”

» Katz had previously won several tournaments and boasted of his prowess in an interview posted to YouTube.

» In a video circulating social media, an announcer is heard introducing Katz by commenting on his intense focus and standoffish attitude. “David Katz keeps to himself. He’s a man of business. … He’s not here to make friends.”

» Authorities say they’ve found Katz’s car, and that they have video of the incident.

» Katz is believed to have stayed in the Jacksonville area the night before the shooting, possibly at a hotel.

» He used at least one handgun to commit the shooting.

» Filings from Katz’s parents’ divorce widely discussed his emotional and socially struggles, as well as his troubles in school. The documents note a hospitalization at Sheppard Pratt Health System in Towson for psychiatric treatment.