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Jerman Neveaux's mugshot following his arrest.

A Jefferson Parish judge has turned down a request that he order an MRI and CAT scan of the brain of a man accused of killing a Jefferson Parish Sheriff’s Office deputy last year. The man's lawyer had asked the judge to order the procedures to check for frontal lobe damage.

Attorney Martin Regan made the request of 24th Judicial District Judge Conn Regan, according to court documents. He also notified the court he has appealed the judge’s Oct. 18 ruling that Neveaux is competent to stand trial.

Judge finds Jerman Neveaux competent to stand trial in shooting death of JPSO deputy

Neveaux, 20, is accused of shooting and killing Deputy David Michel Jr. during a scuffle on a Harvey street on June 22, 2016. Neveaux fled to a nearby backyard where he was soon arrested by JPSO deputies, who were captured on cellphone video kicking and punching Neveaux as they subdued him.

Martin Regan has said officers slammed his client’s face on a kitchen counter as they led him out through the house.

Neveaux has pleaded not guilty and not guilty by reason of insanity.

Martin Regan has argued that Neveaux suffered from lead poisoning growing up in a New Orleans housing project as a child and was found in 2013 to have the comprehension level of an 8-year-old.

'Speechless': A day after killing of JPSO deputy, community tries to cope, recover

After three sanity hearings, Judge Regan ruled that Neveaux is capable of understanding the charges against him and assisting in his own defense.

Regan, the attorney, tried on occasion during that process to get witnesses — most recently a linguist — to testify as to possible frontal lobe damage using photos taken of Neveaux’s face, though the judge has upheld the state’s objections to doing so.

Motions in the case are scheduled to be heard next month.

Neveaux is being held in the Nelson Coleman Correctional Center in St. Charles Parish.

Follow Chad Calder on Twitter, @Chad_Calder.