A federal grand jury in California on Wednesday returned a four-count indictment against a man previously charged in connection with a bombing of an Aliso Viejo spa that killed his ex-girlfriend, prosecutors announced.

Stephen William Beal, 59, of Long Beach, is charged with use of a weapon of mass destruction resulting in death; malicious destruction of a building resulting in death; use of a destructive device in relation to a crime of violence; and possession of an unregistered destructive device, the U.S. Attorney’s Office for the Central District of California said in a statement.

Beal was arrested earlier this month in the May 15, 2018, blast at the Magyar Kozmetica spa, which killed his ex-girlfriend, Ildiko Krajnyak, 48, and seriously injured two other people.

Read more: NBC News