Dunwoody police have arrested Christopher Williams, 20, of Stone Mountain in the killing of Roberto Calderon-Guzman, 28, known to many in Atlanta's nightlife community as drag artist Noxy Cassandra Calderon.

Williams is charged with murder and possession of a firearm while committing a felony and is currently being held in the DeKalb County Jail, said Sgt. Mike Carlson of the Dunwoody Police Department.

Project Q Atlanta was first to report this story.

Noxy Cassandra Calderon, whose legal name is Roberto Calderon-Guzman, was shot and killed on Friday, June 22, in her apartment at Peachtree Place Apartments on Peachtree Place Parkway. On Noxy Cassandra Calderon's Facebook page, she identifies as female.

Carlson said the motive was robbery and that Williams was targeting transsexual sex workers that he sought out on backpage.com. Dunwoody police say they also know of at least one other transsexual person who was allegedly attacked by Williams in DeKalb County and are asking others who are victims to come forward by calling the Det. Jesus Maldonado at 678-382-6925.

“We know of two victims right now. It appears the other victim was robbed on Wednesday prior to our victim. We don't know why he shot our victim,” Sgt. Carlson said.

The first victim, who is also transsexual, reported to police she was robbed, Carlson said. Carlson said the suspect was using the first victim's cellphone and the Dunwoody victim was advertising on backpage.com.

“We want to make sure there are no other victims out there,” he said.

There were two other people in the apartment with Noxy Cassandra Calderon when she was shot, Carlson said. They heard the shooting but did not see it and called 911. Noxy Cassandra Calderson was taken to Northside Hospital where she was pronounced dead.

While the motive in the Dundwoody shooting is robbery, Carlson said that currently no items have been found missing in the apartment. This is the city's first homicide this year.

The Dunwoody Police press release on the arrest:

The motive in this case was Robbery. We believe the suspect was targeting or identifying his victims through backpage.com. The suspect contacted our victim, Roberto Calderon-Guzman, through this site prior to his murder. If there are any other victim’s, we ask they contact their local police department.  

The Dunwoody Police Department has arrested 20 year old Christopher Williams of Stone Mountain, for the murder of Roberto Calderon-Guzman. The homicide occurred at the Peachtree Place Apartments located at 4612-B Peachtree Place Parkway on June 22nd. The victim, a 28 year old Hispanic male, was shot inside his apartment around 1222 hours that morning. He was transported to Northside Hospital where he was pronounced dead. Williams has been charged with one count of Murder (F), and one count of Possession of a Firearm During the Commission of a Felony (F). He is currently being held at the DeKalb County Jail. If you have any further information regarding this incident, please contact Detective Jesus Maldonado at (678)382-6925, or [email protected]

Correction: In an earlier version of this story, it was incorrectly reported the first victim did not report her robbery to police. She did report it to police. Also, this is Dunwoody's first homicide of the year.

Top photo: Noxy Cassandra Calderon was a popular Latina drag queen performing at such clubs as Club Rush. She was killed Friday, June 22, in an apparent robbery. (via Facebook)

Inset photo: Dunwoody Police have arrested Christopher Williams in the shooting of Noxy Cassandra Calderon. (Courtesy Dunwoody Police Department)