missed a curve, crashed through a guardrail, and plowed through a homeless encampment. 62-year-old wilbert williams was killed. he is now charged with dui and vehicular manslaughter. >>> tomorrow, san francisco state will award a degree posthumously to a student shot and killed two months ago. stephen guillermo was gunned down after trying to enter the wrong apartment in his south of market complex. no charges were filed against the man who shot him. at the time of his death, guillermo needed just a few units. his brother and sister will receive his diploma for diplomatic relations. >>> as ktvu's noel walker shows us, even private security is stepping in to help. >> reporter: on his mile and a half beat. ricky vincent knows what belongs on his private security patrol. >> i'm just looking for something that's out of place. >> reporter: and what doesn't. >> today, he's looking out for a firebug. there are multiple fires yesterday in this canyon off park boulevard. >> todayer firefighters were back. >> just have a presence out on the trail. >> reporter: it's a trail frequented by dog walkers,