authorities used shell casings, dna, stolen jewelry, and a cell phone to link cleophus cooksey jr. to nine murders. police say he knew some of the victims, but are still working on a motive. danielle nottingham reports. >> reporter: investigators say cleophus went on a deadly three-week shooting spree between christmas and new year. it included 43-year-old maria villanueva. he then killed his mother and stepfather the following day. that's when a responding patrol officer confronted him. >> cooksey had some blood on him and appeared to be concealing things. >> reporter: police say the 35-year-old suspect is an ex-con victory, spending 16 years in prison for manslaughter and armed robbery 68. out for 18 months and during that time he's bee >> he has been out for 18 months and during that time he's been in and out of jail. >> reporter: police believe this is the expected killer. there was high-tech testing of shell casings that gives immediate results instead of several week. danielle nottingham, cbs news, san francisco. >>> the sentencing hearing for dr. larry nassar has been extende

police say shell casings, cell phone records, and dna linked 35-year-old cleophus cooksey jr.he slayings. the murders occurred over a three-week period last december. he was arrested at a phoenix apartment where his mother and stepfather were found shot to death. >>> it's been more than a week since deadly mudslides inundated montecito. jamie yuccas shows us what is being done with the mountains of mud. >> reporter: this is in montecito. >> this debris field was over three football fields wide. >> reporter: tom fayeram is responsible for clearing sought of this out. it changed elevation of some nabts by as much as six feet. >> our job is to open every creek channel and bridge unplugged because we will get rain and have to get ready for it. >> reporter: the same mass in cleanup is happening along highway 101 where trucks are hauling away thousands of pounds of debris every day. more than 20 million pounds have been dumped here at the ventura county fairgrounds. rocks, trees, plastics, and metals are sorted out and then taken to a recycling center or landfill. they're having to

that this killer is caught. >> reporter: anthia wint says the first time she heard the name cleophus cooksey jr. was thursday morning when police told her he was responsible for her son's murder. he was shot twice on december 13th. chloe ridore is his younger sister. >> my brother was an innocent bystander and, you know, it's sad that it was him. >> reporter: cooksey seen in this youtube video rapping about murder is accused of killing seven men and two women in the phoenix area from november 27th to december 17th. all died from gunshot wounds. phoenix police credit advanced ballistic technology with helping link cookseys to the murders. phoenix is one of five cities that joined a national program allowing agencies to rapidly share, analyze and process evidence from different crime scenes. >> we solved nine homicides in three weeks. i think that's astounding for any police department. >> reporter: jonathan howard is with the phoenix police department. >> do you think you might link this suspect to other crimes? >> i think there is a possibility. in fact, i'm going to say i think there's a proba

this morning, cleophus cooksey jr.s waking up in a jail an accused serial killer. >> nine people shot. >> reporter: police arresting the 35-year-old last month charging him with the december murders of his mother and stepfather. but on thursday, announcing seven more counts of homicide. the killing spree starting after thanksgiving and chillingly continued for 21 days in this 20-mile area in and around phoenix. he murdered a security guard and stole his gun and police say he used that gun to murder six more people including maria villanueva who they say he sexually assaulted before her brutal murder. her sister devastated. >> i don't even know how i could face him. he took a part of my heart. >> reporter: he is seen in this youtube video rapping about killing. ♪ murder >> reporter: he also incriminated himself during several interviews. >> those conversations gleaned evidence that licks him to these crimes. >> do you believe there are more victims out there in i do believe that. the coldness, the frequency, the manner