Corona police have released a composite sketch of a suspect who sexually assaulted a womanin a Walmart parking lot Thursday night.  Investigators say the suspect approached the 34 yearold victim as she exited her car and asked her for spare change.  When she reached into hercar to get the money, police say the man brandished a knife and forced her to drive to a secludedarea in Riverside County where he sexually assaulted her.  Nearly seven hours later, thesuspect made her drop him off near La Sierra and Indiana Avenues, exited the car and fled onfoot.  The suspect is described as a white man, possibly in his 40s, around 5’7 with aslender build.  He was last seen wearing jeans, grey pullover hooded sweatshirt and blackbaseball cap.  Anyone with information is urged to contact the Corona PD at 951-736-2330 orDetective Mario Hernandez at 951-279-3659.