PHOENIX (3TV/CBS 5) - Phoenix police said they arrested a man accused of sexually assaulting a 13-year-old girl last month.
Stefan Sleeper, 22, was arrested Friday after investigators identified him and developed probable cause to arrest him, according to the Phoenix Police Department.
[ORIGINAL STORY: Phoenix police looking for man who sexually assaulted 13-year-old girl]
On Oct. 29, police were called to the area of Seventh Street and Vineyard Road for a reported sexual assault.
Police said a witness reported seeing the suspect assault the victim in an open field.
The victim had been walking with her 8-year-old brother when the alleged assault occurred.
Police said the suspect was interrupted by a witness who heard the victim screaming for help.
During the investigation, authorities learned Sleeper was also identified as a suspect in an unrelated, armed robbery that happened at a business near 3400 W. Southern Avenue, police said.
Sleeper was booked for sexual assault, kidnapping and robbery.
Police said the investigation is ongoing.