The thefts happened between Sept. 2 and 3 at the home of businessman Richard L. Weisman on Angelo Drive, according to the Los Angeles Police Department.
The family's longtime nanny arrived at the home Sept. 3 to find the color screenprints missing from the walls. She immediately went to a neighbor's house and called police.
Eleven artworks, each 40 inches square, were stolen. Among the stolen items were images of O.J. Simpson, Muhammad Ali, soccer star Pele and tennis champion Chris Evert. A portrait of Weisman was also taken.
It's not known exactly how much the collection is worth, but Weisman tried to sell it in 2002 for $3 million.
Weisman's home had other valuable artwork, but it wasn't touched.
"This was a very clean crime," Detective Mark Sommer said. "(The home) wasn't ransacked."
"The theft of Warhol's 'Athlete Series' represents a profoundly personal loss to me and my family," Weisman said in a statement. According to a catalog of Warhol's work, Weisman commissioned the artist in 1977 to create the portraits of iconic sports figures. Other portraits in the collection include golfer Jack Nicklaus, figure skater Dorothy Hamil, Kareem Abdul Jabbar and and Major League Baseball pitcher Tom Seaver.
A neighbor saw a maroon van in the driveway of Weisman's home around the time of the robbery, and police are seeking more information about that.
Anyone with any information regarding this theft was urged to call the Los Angeles Police Department's Art Theft Detail at (213) 485-2524 or 1-877-LAPD-24-7.