ºÃÉ«tv

Qi, charged with first-degree murder and a gun-possession count, was after a judge said two mental evaluations determined he likely suffers from untreated schizophrenia. Qi was ordered moved to a state mental hospital. His legal situation could change if his condition improves.

The search warrant applications reveal more details about Qi and what authorities say happened, The News & Observer of Raleigh . An FBI agent in the days after the shooting sought the warrants to search Qi’s phone, apartment and car. Warrant documents stating that searches were carried out were filed in court last week.

The shooting resulted in an and search for the suspect that frightened students and faculty, who had just returned to the university system's flagship campus for the start of the fall semester.

The warrants said a witness inside Caudill Laboratories heard an argument between Qi and Yan, a professor in the Department of Applied Physical Sciences, followed by five gunshots. Officers found Yan dead in an office area, and the witness saw Qi walking by with a gun in his hand, according to the warrants, which also said other witnesses identified the shooter as Qi.

Authorities found Qi about 2 miles (3.2 kilometers) from the building. Qi, who is from China, denied owning a pistol but said he rented and shot one at a firing range with an instructor two weeks earlier, the warrants state.

But a search of Qi’s apartment uncovered a notebook with information that led agents to identify someone who then told authorities he had sold a 9 mm firearm a few days earlier to a man he identified from a photograph as Qi, the legal documents say.

Qi's student visa prevented him from legally possessing a firearm, the warrants state. Qi’s arrest warrant from August accused him of possessing a 9 mm pistol unlawfully on campus.

Staff at the shooting range in nearby Wake County said Qi visited the range on Aug. 17 and Aug. 27, according to the documents, and said Qi rented a pistol that was similar to the firearm that it's believed he had purchased. Qi had purchased 9 mm ammunition at the range, a warrant states, and police recovered shell casings from 9 mm ammunition at the site of the killing.

Authorities have not released a motive for the shooting and said previously they had not found the weapon used in the killing. In paperwork he filled out to use the range, Qi listed Yan as his emergency contact, according to a search warrant.