. >> duraneanna durante has the lt on the investigation and some unanswered questions for investigators. >> reporter: police say that they fielded about 500 maybe 1,000 tips since this case broke. tonight they say there is specific information that you can get for them. >> we would welcome any tips from people who can give us any information. the investigation is still ongoing and we are gathering as much information as we can. >> reporter: police are not saying why they think david desper killed a young woman over a lane change. they say 28-year-old desper shot bianca roberson and then took off. at first police say it was a car crash. it wasn't until later they learned roberson was shot. roberson was getting ready to head to college in the fall. there is no indication she or desper knew each other. one reason why sources say they are checking video where roberson was shopping with her family and where she was last seen driving before her final minutes. desper's car was not found at his family home but the gun police say he used to kill her was inside his bedroom. desper's lawyer says i

. >> duraneanna durante has the lt on the investigation and some unanswered questions for investigators reporter:ic