As crowds were mourning the loss of former Prime Minister Shinzo Abe at Tokyo’s Zojoji temple, the site of his funeral, on Tuesday, a slow trickle of news continued to emerge about the suspect in the deadly shooting of Japan’s longest-serving prime minister.

Here’s what we know so far about the alleged shooter, 41-year-old Tetsuya Yamagami, and how the investigation is proceeding.

What happened?