let's bring in our investigative reporter jaxon van derbeken. jaxon, you've been uncovering a lot of details about this entire situation as it's unfolded in the last 24 hours. do we know any specific motive, though, at this point right now? >> reporter: well, we have two independent law enforcement sources who believe the motive was tied to his feeling that he was disrespected over an extended period of time by co-workers at both the mushroom farms where he had worked. the first attack was after he apparently, according to investigators, sources believe that he had been slighted by a man he considered a boss, and that man drove off in a bicycle and went to a nearby greenhouse, where he was tracked down and shot. and so that was the beginning of this horrific event that ended up killing seven folks. >> and for the people you're speaking with, this was targeted to specific co-workers he's dealt with before. is that correct? >> reporter: right. he had grudges. no one wants to get into the details of what these perceived slights or disrespect actual

. >> well, sources close to the investigation have been talking to our jaxon van derbeken since day one. today they gave us new details that we did not hear from the gunman. coming up in about ten minutes, what we're learning about the moments that led up to that shooting. >>> and it turns out this is not the first time a gun has been fired at one of these farms. tonight a d.a. says a disgruntled worker opened fire seven months ago. >> our defendant, mr. medina, one night came over at 11:30 at night, started banging on the door of the trailer that our victim and his family lived in, saying that he was going to kill our victim and his entire family. and he started trying to turn the door handle. our victim held it, told his family run and hide. and at that point he looked out the glass in the door and saw the defendant raise a gun and fire one shot. the shot went through the glass. it did not hit our victim. did not hit anybody inside their trailer. went through the wall into the next door trailer. where a couple was living. and lodged there. fortunately, nobody was struck by the shot. >

once again, it came right back to the northwest corner of the apartment, jaxon van derbeken, nbc bayrea news. >> this has been going on for year, and jaxon has been digging into the problems at the tower the entire time. can you find the reports on our website, nbcbayarea.com, click on the investigations tab. >>> all of our storms really paying off in the sierra. the statewide snowpack is at 245% of normal for this time of year. now dwee have some satellite pictures that gives a bird's-eye view of the snowpack this year compared to last year. january 2022, there's some snow, but nothing like what the sierra should look like during the winter. now this picture take and few days ago, big difference. i'll show you the side by side comparison. can you see that. >> wow. >> look at all the snow into the southern sierra. >> jeff is back with us. >> we are looking at temperatures down to the freezing level as we roll through tomorrow morning, and the other thing i wanted to share with you is the drought update just in case you missed my earlier updates today. we have had some big improvement

" >> yeah. >> after two days on life support, jaxon died.lee agonized over whether she should tell police about her suspicions. >> she had said, you know, "what if they wanna talk to me? " i'm like, "you talk, " you know? >> but the more halee's mom thought about it, the more she worried what might happen to halee if she spoke out. thaddeus had a bad reputation around town. halee could be poking a hornet's nest. >> she absolutely could have. >> if she starts making accusations. now halee was dead. and heather wondered if her fears had come true had thaddeus killed halee to shut her up? >> i just felt like you know, he was looking at some pretty serious charges if i had to think of people who had reasons to hurt her, that would have been number one. >> the day after halee was murdered someone sent heather this snapchat video. it was thaddeus brandishing a gun. you got that video, so that must have really heightened -- >> oh, the video was -- >> -- your suspicion. >> huge. i was positive at that point. >> he did it. and heather wasn't the only

jackson jaxon van derbeken has been speaking with law enforcement all afternoon. are you learning anything new? >> all we know is that there are the two separate locations on that one big sprawling location and that's -- and then the secondary crime scene had three victims there. two separate crime scenes on one location, separated from each other. so it's quite -- likewise, a very complex and evolving thing. but we do understand that he -- after turning himself in, he was willing to give a statement. at this point in time they are in the midst or preparing to interview him to find out what the true motive is. it was an apparent workplace scenario -- >> you're referring to the suspect, 67-year-old zhao chunli. we're saying that he turned himself in. was there any sort of man hunt or did they crack him down somewhere or did he literally just come and turn himself in to wherever the authorities were? >> we're hearing different things. there was some indication that they had a line on him and basically were approaching him when he did come to turn himself in at the s

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jaxon vanderbeck , nbc bay area. >>> when you drive a school bus for 50 years, you come across a lot of students. one driver has developed a special bond with his students that is unlike any other. we have the story next. >>> and on this sunday night we are seeing gusty winds over the >>> driving a school bus is not an easy job. many of us would not last a day. one woman has been driving for more than 50 years. >> when it comes for services for children with special needs , what about the bus driver? for families in san francisco, they know how important a good one can be and they have had a great one for a very long time. here is garvin thomas with tonight's bay area proud. >> reporter: over the past 50 years, the streets of san francisco may have gotten meaner , but the woman navigating them , well, she certainly hasn't. on her bus route, kindness has always been along for the ride. >> it doesn't hurt! >> reporter: it was in 1971 when shirley answered a help wanted ad for school bus drivers. she soon found her calling driving special needs students. >> i have been to funerals. >> r

jaxon vanderbeck , nbc bay area. >>> when you drive a school bus for 50 years, you come across a lot of students. one driver has developed a special bond with his students that is unlike any other. we have the story next. >>> and on this sunday night we are seeing gusty winds over the are seeing gusty winds over the [narrator] everyone needs quality health insurance, even if you're healthy and active. covered california is a free service to help you get covered. 90% of members have received financial help. and every plan offered is comprehensive, covering preventive care, doctor visits, emergency care, and more. regardless of your income, check today to see how covered california can help you. and if you have questions, there's free assistance every step of the way. covered california, this way to health insurance. enrollment ends january 31st. go to coveredca.com. business can happen anytime, anywhere. so help yours thrive and stay connected with the enrollment ends january 31st. comcast business complete connectivity solution. it's the largest, fastest, reliable network. advanced g