WACO, Texas -- Baylor basketball player Patrick Dennehy died of gunshot wounds to the head and was killed in the field where his body was found, according to a preliminary autopsy report released Wednesday.

Dennehy's official cause of death is homicide, the Southwestern Institute of Forensic Sciences in Dallas said in its report.

The report does not specify how many times Dennehy was shot, whether he suffered any other wounds or when he died. The complete autopsy is expected to take several more weeks.

The one-page preliminary report was released Wednesday to Belinda Summers, a justice of the peace in McLennan County, where the remains of the 21-year-old athlete were found Friday in a grassy field about four miles from campus. Dennehy had been missing about six weeks.

Investigators had searched earlier in the week at nearby gravel pits, a site police say was provided to them by Carlton Dotson, Dennehy's roommate and former teammate, who is charged with murder.

Dotson was arrested July 21 after telling FBI agents he shot Dennehy, according to the arrest warrant affidavit.

After his arrest, Dotson told The Associated Press that he "didn't confess to anything." Dotson, 21, remains jailed without bail in his home state of Maryland pending extradition to Texas.

Dotson's attorney, Grady Irvin, did not immediately return a call seeking comment Wednesday.

Two newspapers have reported that a gun and shell casings were found near Dennehy's body when it was discovered.

The Waco Tribune-Herald reported Wednesday that the gun was a .32-caliber revolver that belonged to Dennehy, according to an unidentified source close to the investigation. Authorities also found a number of live .32-caliber rounds, the newspaper reported. There was no evidence the revolver had been fired, but officials recovered nearby shell casings from a 9mm pistol, according to the paper.

The Dallas Morning News reported Tuesday that police had found a 9mm pistol at the scene, along with some unspecified shell casings.

McLennan County sheriff's Capt. Paul Wash on Wednesday declined to say if any weapons were found near Dennehy's remains.

Jessica De La Rosa, who dated Dennehy two years, said she tries not to dwell on what authorities have told her about what they believe happened in mid-June in the field south of Waco.

"It's kind of hard for me to hear that something like that is what took his life," said De La Rosa, who lives in Albuquerque, N.M. "But it was barely a split second ... so I believe he didn't feel any pain."

Dotson transferred to Baylor last year from Paris Junior College in East Texas. Dennehy, because of NCAA eligibility rules, had to sit out a year after transferring from New Mexico, where he was kicked off the team for losing his temper.

Dennehy, a 6-foot-10 center, was last seen on campus June 12; his family reported him missing June 19. His vehicle was found abandoned in a Virginia Beach, Va., parking lot the next week.

Baylor officials said a morning funeral service for Dennehy was scheduled for Aug. 7 at the Jubilee Christian Center in San Jose, Calif., near where he grew up.

A campus memorial service for Dennehy is being planned for September at Baylor, the world's largest Baptist university with 14,000 students.

Meanwhile, a day after basketball coach Dave Bliss addressed allegations of possible NCAA violations, Dennehy's roommate, Chris Turk, said that he was "unable to sit quietly as the university lies and denies all wrongdoing."

Baylor opened a new inquiry last week, prompted by claims from some of Dennehy's relatives and friends.

"Since the very beginning of my roommate's disappearance, it seems to me that Baylor and the coaching staff have done the best they could to simply wash their hands of the negative publicity," Turk said Tuesday.

A committee of three Baylor Law School professors will investigate allegations that an assistant coach told Dennehy his education and living expenses would be paid if he gave up his scholarship for a year. Baylor tuition and fees cost more than $17,000 a year.

The committee also will examine whether Dennehy received $1,200 to $1,800 from an assistant coach toward a car loan for his Chevrolet Tahoe.

Turk, who does not attend Baylor, said Dennehy "hinted" that one or more coaches helped him buy his vehicle. Turk said Dennehy told him that a coach paid for his vehicle repairs.

"In the time I spent with Patrick, it is very clear to me that not everything in Baylor sports was as it should be," Turk said. "... In my opinion, Baylor's active denial of all wrongdoing strays far from the Christian principles that the university is supposed to uphold."

Baylor athletics department spokesman Heath Nielsen said Tuesday that the university stands by Bliss' statements denying any knowledge of NCAA violations.