GRAPEVINE, Texas (AP) - Dallas Cowboys special teams player C.J. Spillman is under investigation but hasn't been arrested or charged after a report of an alleged sexual assault at the team hotel last month.
Grapevine police spokesman Sgt. Robert Eberling said Wednesday night that the alleged assault took place early Sept. 20 at the Gaylord Texan Resort and Convention Center.
The team flew to St. Louis later that Saturday, and Spillman played against the Rams the next day.
He has played in all four games, including last weekend at home against New Orleans. His only tackle of the season came against the Rams. Spillman is listed as a safety but hasn't played defense this season.
Spillman's agent, Ron Slavin, and attorney Bruce Ashworth declined to comment. The Cowboys didn't immediately respond to an email seeking comment.
Eberling said no other details were being released because the investigation is ongoing.
The Cowboys signed the 28-year-old Spillman on Sept. 1, two days after the sixth-year player was among the final cuts by San Francisco. The former Louisville defensive back spent most of his first five seasons with the 49ers.
NFL players who have been arrested:
NFL Players who have been arrested
Cowboys' Spillman subject of reported sex assault
In this Sept. 21, 2014, photo, Dallas Cowboys' C.J. Spillman warms up for the Cowboys' NFL football game against the St. Louis Rams in St. Louis. Spillman is under investigation but hasn't been arrested or charged after a report of an alleged sexual assault at the team hotel last month. Grapevine, Texas, police spokesman Sgt. Robert Eberling said Wednesday night, Oct. 1, that the alleged incident took place early the morning of Sept. 20 at the Gaylord Texan Resort and Convention Center. Spillman's agent and attorney declined to comment. (AP Photo/Tom Gannam)
This Sept. 17, 2014 booking photo provided by the Maricopa County, Ariz., Sheriff's Office shows Arizona Cardinals running back Jonathan Dwyer. Arizona Cardinals running back Jonathan Dwyer was arrested Wednesday, Sept. 17, 2014 on aggravated assault charges in connection with two altercations at his home in July involving a woman and their 18-month-old child, the latest in a string of such cases involving NFL players. (AP Photo/Maricopa County Sheriff's Office)
This photo provided by the Montgomery County sheriffâs office shows the booking photo of Adrian Peterson. Peterson was indicted in Texas for using a branch to spank one of his sons and the Minnesota Vikings promptly benched him for their game Sunday, Sept. 14, 2014 against the New England Patriots. Peterson turned himself in early Saturday at a jail in Montgomery County, near Houston, where he has a home. He was processed and released. (AP Photo/Montgomery County sheriffâs office)
CHICAGO, IL - SEPTEMBER 07: Brandon Marshall #15 of the Chicago Bears questions an incomplete pass call at the end of the third quarter of their game against the Buffalo Bills at Soldier Field on September 7, 2014 in Chicago, Illinois.The call was challenged and overturned for a complete pass. (Photo by Jonathan Daniel/Getty Images)
EAST RUTHERFORD, NJ - AUGUST 07: Wide receiver Quincy Enunwa #82 of the New York Jets looks on against the Indianapolis Colts during a preseason game at MetLife Stadium on August 7, 2014 in East Rutherford, New Jersey. Enunwa, from the Jets' practice squad, was arrested this week after being accused of fighting at a New Jersey hotel near the team's practice facility. Florham Park police say he was charged Sunday, Aug. 31, 20134, with simple assault and later released on his own recognizance after "an altercation with an individual." (AP Photo/File) (Photo by Alex Trautwig/Getty Images)
San Francisco 49er defensive end Ray McDonald is seen in an undated photo provided by the San Jose Police Department. McDonald, 29, was arrested early Sunday, Aug. 31, 2014 by San Jose Police on felony domestic violence charges. San Jose police Sgt. Heather Randol says McDonald was taken into custody after officers responded to a home in an upscale neighborhood. (AP Photo/San Jose Police Department)
This photo provided by the Mecklenburg County Sheriff's Department shows Carolina Panthers defensive end Greg Hardy after his arrest in Charlotte, N.C., Tuesday, May 13, 2014. Hardy was arrested for assault on a female and communicating threats, according to Charlotte Mecklenburg police. Hardy turned himself into Mecklenburg County police on Tuesday morning. (AP Photo/Mecklenburg County Sheriff's Office)
ARLINGTON, TX - AUGUST 16: Ray Rice #27 of the Baltimore Ravens sits on the bench against the Dallas Cowboys in the first half of their preseason game at AT&T Stadium on August 16, 2014 in Arlington, Texas. (Photo by Ronald Martinez/Getty Images)
MINNEAPOLIS, MN - AUGUST 29: A.J. Jefferson #24 of the Minnesota Vikings looks on during the second half of the game against the Tennessee Titans on August 29, 2013 at Mall of America Field at the Hubert H. Humphrey Metrodome in Minneapolis, Minnesota. (Photo by Hannah Foslien/Getty Images)
This booking photo provided by the Maricopa County Sheriff's Office on Friday, Mary 3, 2013, shows Daryl Washington. Authorities say the Arizona Cardinals linebacker has been arrested for allegedly assaulting his ex-girlfriend, who is the mother of his baby daughter. Maricopa County prosecutors say Washington had his initial court appearance Friday after being booked on suspicion of two counts of aggravated assault. (AP Photo/Maricopa County Sheriff's Office)
OAKLAND, CA - DECEMBER 18: Amari Spievey #42 of the Detroit Lions stretches during pre-game warmups before the game against the Oakland Raiders at O.co Coliseum on December 18, 2011 in Oakland, California. The Lions won the game 28-27. (Photo by Thearon W. Henderson/Getty Images)
MIAMI GARDENS, FL - NOVEMBER 25: Leroy Hill #56 of the Seattle Seahawks looks on during a NFL game against the Miami Dolphins at Sun Life Stadium on November 25, 2012 in Miami Gardens, Florida. (Photo by Ronald C. Modra/Sports Imagery/ Getty Images)
PITTSBURGH, PA - AUGUST 30: Running back/kick returner Chris Rainey #22 of the Pittsburgh Steelers looks on from the sideline during a preseason game against the Carolina Panthers at Heinz Field on August 30, 2012 in Pittsburgh, Pennsylvania. The Steelers defeated the Panthers 17-16. (Photo by George Gojkovich/Getty Images)
CINCINNATI, OH - AUGUST 25: Robert Sands #49 of the Cincinnati Bengals looks on against the Carolina Panthers during an NFL preseason game at Paul Brown Stadium on August 25, 2011 in Cincinnati, Ohio. The Bengals won 24-13. (Photo by Joe Robbins/Getty Images)
CINCINNATI, OH - AUGUST 16: Adam Jones #24 of the Cincinnati Bengals watches his team from the sidelines during the game against the New York Jets at Paul Brown Stadium on August 16, 2014 in Cincinnati, Ohio. The Jets defeated the Bengals 25-17. (Photo by John Grieshop/Getty Images)
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The alleged assault came less than 24 hours after NFL Commissioner Roger Goodell held a news conference to address concerns about the way the league has handled domestic violence cases.
"Obviously, we see what's going on with the NFL, but these things are very sensitive in nature when it comes to the victim," Eberling said. "We don't release any details involving these type of crimes while they're under investigation."
Goodell and the league were widely criticized over a two-game suspension for Baltimore running back Ray Rice after he knocked out his then-fiancee in a hotel elevator.
The commissioner later acknowledged the punishment was too light and said future first offenses in domestic violence cases would result in six-game bans. When an explosive video surfaced showing Rice punching the woman, he was released by the Ravens and suspended indefinitely by the league.
The NFL also has been rocked by a pair of assault cases last month that sidelined running backs Adrian Peterson in Minnesota and Jonathan Dwyer in Arizona.
Peterson was indicted in Texas on felony child-abuse charges for using a tree branch, or "switch," to discipline his 4-year-old son.
Dwyer won't play again this season after his arrest on aggravated assault charges. A law enforcement report says he head-butted his wife and broke her nose after she refused his sexual advances, and punched her in the face the next day.
Peterson and Carolina defensive end Greg Hardy are on a paid leave through a special roster exemption granted by the league. Hardy is appealing his conviction in a domestic violence case involving an ex-girlfriend in North Carolina.
San Francisco defensive lineman Ray McDonald is playing after he was arrested on suspicion of domestic violence at a home he shares with his fiancee. He hasn't been charged.