According to the autopsy, released Tuesday, Williams was shot with a large caliber round, which traveled through his neck from left to right.
The report said Williams had a blood alcohol content of .051, which is under the legal limit, and had no drugs in his body.
Williams was struck once in the neck and two other passengers were wounded when at least 14 shots were fired into the stretch Hummer that had just left a New Year's Eve party at a nightclub.
Police are still investigating the slaying, five weeks after it happened.
While an SUV police said was involved in the shooting was found days later, only one arrest has been made in the case. Police have described that man, currently jailed on a parole violation, as a "person of interest" rather than as a suspect in the homicide.
A $102,000 reward has been offered in the case, with members of the Broncos putting up $100,000 of that sum.
Detective Virginia Quinones also asked the public for help.
"The smallest piece of information may ultimately be the key
that unlocks this investigation," she said.
Meanwhile, the team is still
finding ways to honor Williams' memory.
On Monday, the Broncos announced their plans to establish the Darrent Williams Memorial Grant, which will donate $50,000 a year to organizations in the Denver community that promote positive alternatives for young people. And an auction of Williams' two Super Bowl tickets and five nights at a Miami hotel drew a winning bid of $6,600 on eBay.com; the profits from the auction will go to a foundation to support Williams' children.
The Associated Press contributed to this report.