The case against Travis Reinking, the man suspected of killing four people in a mass shooting at a Nashville Waffle House, is back in court two months after he was committed for mental health treatment.

A judge committed Reinking to a mental hospital in August for treatment of schizophrenia that was so severe it delayed court proceedings in the case. Mental health officials have since deemed Reinking competent to face his charges in court.

The Davidson County district attorney's office confirmed Reinking's case was bound over to the grand jury Tuesday after his defense attorneys waived a preliminary hearing.

The move was a significant step toward a criminal trial — the grand jury will consider the evidence and decide what charges should be sent to a jury.

A spokeswoman for the Nashville public defender's office, which is representing Reinking, did not respond to questions about the latest development.

More:Travis Reinking, Waffle House shooting suspect, committed for treatment for schizophrenia

Defendants are constitutionally required to meet a series of requirements before a trial can proceed: They must be able to work with an attorney, to understand court proceedings and to understand consequences of a trial.

Legal experts have said an insanity defense still is possible in this case. While that argument focuses on Reinking's state of mind at the time of the shooting, Reinking was committed because of his mental state in jail.

Reinking is charged in the deaths of Taurean C. Sanderlin, 29; Joe R. Perez, 20; DeEbony Groves, 21; and Akilah DaSilva, 23. He also faces four counts of attempted homicide and one count of using a firearm while committing a dangerous felony.

The Perez and DaSilva families have filed civil lawsuits against Reinking and his family.

Reach Adam Tamburin at atamburin@tennessean.com or 615-726-5986 and on Twitter @tamburintweets.