The man behind a deadly shooting at a Florida video game tournament had previously been hospitalized for mental illness, according to court records in his home state of Maryland.

A champion gamer’s decision to open fire Sunday afternoon during a video competition — killing two people and wounding nine others before killing himself — has prompted calls from gamers for more security at esports tournaments.

Police searched on Monday for a motive in the third mass shooting in Florida in two years, which left two people dead and 11 wounded in Jacksonville, before the gunman killed himself at a video game tournament.