Authorities may provide answers Tuesday to some of the questions surrounding a 23-year-old war veteran accused of stabbing four homeless men to death in California.

Orange County District Attorney Tony Rackauckas, representatives from the FBI, the county sheriff's office and the Anaheim police department are all expected to be at a news conference Tuesday to discuss legal issues concerning Itzcoatl Ocampo.

Ocampo was arrested Friday night after he allegedly stabbed a transient to death, Anaheim Police Sgt. Bob Dunn said.

The suspect has not been arraigned in relation to that or the three other killings, and police have not yet detailed evidence behind their accusation.

The arrest left those who know Ocampo confused.

A friend said Monday that "something happened" to Ocampo after he came back from serving in the U.S. military in Iraq.