earlier we spoke to mike upchurch, the head of the phoenix chapter of the guardian hopes to achieve on their walk tonight. >> the goal is to get the public informed. also to get somebody if they know something, say something, know anything about this, there is a $50,000 reward on this guy. we are empowering the community to take back the community until -- and tell this serial killer we are not standing for it. we will do what's right and you will go to jail. >> police are asking that anyone with information contact silent 480-witness. your tips remain anonymous and if you give them a tip that leads to an arrest, police are offering a $50,000 reward. reporting live from phoenix, kristy siefkin, "fox 10 news." >>> delta has had its troubles struggling through third day of computer problems. 150 flights canceled this morning. 800 scrapped yesterday and 1,000 canceled on monday. the system that airline uses to check in and board passengers as well as dispatch running slow loosm the problem started monday after a critical piece of equipment failed at the airline's headquarters in atlanta.