A 36-year-old transient accused of stabbing a man during an unprovoked attack at the downtown Riverside Metrolink station pleaded not guilty Wednesday to attempted murder.

Richard Demetrius Bonner was arrested following a 24-hour investigation by Riverside police into the Sept. 23 attack that occurred around 8 a.m. at the train station in the 4000 block of Vine Street, adjacent to the Riverside (91) Freeway.

Along with attempted murder, Bonner face sentence-enhancing allegations of using a deadly weapon in the commission of a felony and inflicting great bodily injury. Riverside County Superior Court Judge Emma Smith scheduled a Dec. 7 felony settlement conference at the Riverside Hall of Justice.

Bonner’s arraignment was postponed over two months while he underwent a battery of psychological exams requested by his public defender to determine whether he was mentally competent. He was determined to be of sound mind, and his case returned to the docket.

The victim, whose name was withheld, was waiting for a commuter train when he was accosted, according to Riverside police Officer Ryan Railsback.

“After a brief verbal exchange, the suspect produced a knife and unprovokedly stabbed the victim in the neck,” he said. “The suspect fled … north along the railroad tracks.”

Witnesses called 911, and the injured man was taken to Riverside Community Hospital, where he underwent surgery.

An hours-long search of the area was conducted with bloodhounds, but officers could not locate the assailant.

After video security surveillance images of the knife-wielding man were posted to social media, the police department received numerous tips as to who he might be, Railsback said. He said detectives ultimately confirmed that the alleged perpetrator was Bonner, who was tracked to a house in the 12100 block of Graham Street in Moreno Valley, where he was taken into custody without a struggle.

Bonner, who has no documented prior felony convictions in Riverside County, is being held in lieu of $1 million bail at the Robert Presley Jail in Riverside.

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