Enrique Vasquez Rodriguez, 36, is accused of starting a sexual relationship with the girl between May and July.
Rodriguez is described as a male Hispanic standing 5 feet 7 inches tall and weighing 185 pounds, with brown hair and brown eyes.
Rodriguez is known to frequent Downey, Bell, Fontana and San Bernardino County.
The case was presented to the Los Angeles County District Attorney's office and a criminal complaint was filed against Rodriguez. There is an arrest warrant for Rodriguez for sexual assault which carries a $1 million bail, according to Downey Police.
If anyone has information as to the whereabouts of Enrique Rodriguez please contact the Downey Police Department at (562) 904-2308, Detective Hill at (562) 904-2335 or your local police agency.
To provide information anonymously, call Crime Stoppers by dialing 800-222-TIPS (8477) or by texting the letters TIPLA, plus your tip, to CRIMES (274637), or by using the website http://lacrimestoppers.org