Crime Scene -

Everything you said there, EastTex, is right along the lines of my thinking. Harte's top agent double dipping and possibly crossing over to the competition gives Jeff a motive for murder and no information so far is contradicting that he was the last person to see her alive.
The time Jeff was at the Holistic store is approximate, anywhere from 6:30pm to near closing at 7:00pm. He claims to have seen her when he was leaving.
The last phone call Annette took was at 7:07pm, an incoming 8 minute call from Darren. An 8 minute long voice message? Possibly if routed to one of those services that lets you review, erase and leave a different message, you can take all day if you want. Darren then tries to call several times through the 9 o'clock hour. Is he creating an alibi? or does he really not know Annette isn't answering because she is by this time dead.
How does Jeff kill Annette after 7:09pm and be home a "little before" 7pm as stated by Janet Johnson in Elana's alibi check? Perhaps he left again, to go kill her, and his wife is covering for him by saying he came home at 7 and didn't leave again for the night.
Bear in mind that Jeff never remarks that the nail gun is left out. We must conclude the murderer found it or knew where it was. By the body's position, she looks like she was about to use the files, possibly squatting down, and was unaware of any danger.

The timing for Jeff is off if you believe what time he was home but never left again. But bear in mind of the three who even claimed to know about the nail gun, he was the only one who said he knew where it was kept. I still don't think that her being the mole was enough for him to kill her even if she was his star agent. I might be enough for Kurt or Joanna to do it.
I think I have a motive worked out but I'll admit it's only conjecture and probably no way to prove it and it has to do with the sd card.However I do have some other points of interest we might think about.
1. Chris Frost called Annette 7 times in a 7 day period (9/1thru 9/. All were short like she may have left a message. The interesting thing is she never called her at all in the whole week of the murder (9/19 thru 9/16). Could be significant or not.
2. On Saturday morning Annette called the office and hung up after 1 minute. Who was she expecting to call or was she checking to see if Jeff had made it in yet? The office didn't open until 9 a.m.
3. She left Kyle's house and went to the Road House. Was that where she was supposed to meet Naomi or did she go there to meet someone else? They do serve food there and she could have had supper there since Naomi cancelled. Cell phone records show she was there about an hour, give or take. Darren was the last person to talk to her on the phone but who was the last person she talked to at the Road House? We need to interview the bartender. We know from the Fontaine case that the bartender knows most people in town and usually knows who is seeing who. He would defiantly notice Annette and whoever she was with.
4. Elliot said she was out of the office sometimes and he was there by himself but that he was only there late afternoons or after hours.During the week of the murder, he called her on Wednesday afternoon while she was looking at property. Then she called him back right after that. But what is funny to me was he said he and Annette worked after hours on Friday until 10:30 p.m. He called her that Friday at 2:15 p.m. and again at 4:29 p.m. She got home at approximately 11:00 p.m. and called him again at 11:28 p.m. He told the detectives that he got an email from Annette about 11:00 or 11:30 that he didn't need to come in on Saturday. Is this not a little white Lie? If she called him at 11:28 after she got home,wouldn't she have told him then? It was a 2 minute call but that's time enough for her to say," hey, I don't need for you to come in tomorrow. I got this."

I have a hunch that Darren killed her. He was jealous, he realized he was losing her, he followed her around, perhaps installed the clock with the video card, found out about Kyle and planned to kill her. He called, set up a meeting that he knew she would never keep, and then went to the office and killed her and potentially swung by her house to get the SD card. There was no signs of forced entry at her home, so someone had to have taken it that had keys (that person also might have taken Annette's since hers were missing). Then he called several times to cover his tracks.

After this, he went home, was seen by a neighbor at 9:30. The neighbor said that he didn't seem anxious, surprising for someone who was calling his girlfriend every few minutes. Then he went to the bar and got sloshed to further establish his alibi and potentially drown any guilt that he was feeling. He stated that he was a social drinker, but he gets sloshed that night of all nights? The bartender also said that he seemed upset about something. Maybe an act? Or maybe the guilt showing through?

Anyway, my $0.02.

I still think the Klugman's car going stealth in the middle of the night is a little suspicious... but despite that, I really can't see a good motive there.

Warrants are issued!

I think that although everyone seems to have a motive, you will find that it all ties back to one person in the end. I think Annette removed the sd card herself and had it with her when she was killed. It had some important information on it that she was going to use against Jeff to try to pressure him one more time into making her a partner. With the card missing, no one will know what it is unless they find it in the warrant search. I hope they do. I would like to see if it matches a theory I have. It seems like Annette didn't like to take men to her house as a general rule or they would have found more prints in the living room than they did. Whoever did take her keys was there trying to find something in particular.
Who would you turn to for help if you were in a bind? Your best friend or your lover. If you were afraid of getting caught, your best friend could easily get his wife to do the deed for you and that way you both would be in the clear. Your lover would also be one to turn to on maybe a small matter but you wouldn't want to trust a large matter to someone whom you couldn't control if you broke up.

Another trip to the ER kept me from posting my theory as to who killed Annette before the arrest warrant was issued. I kept chasing every motive I could find and still could only come up with two possibilities. One was Jeff and the other was Meg. I couldn't figure out how to connect Meg with the keys. No matter how you looked at it, it had to be someone whose prints were on the nail gun.At times it seemed like the Agatha Christie novel "murder on the Orient Express" where every one had a motive and it turned out that everyone did it. They all stabbed the man. The same here. Seemed as if everyone had a motive, except Meg at first. But I kept going back to the money in Annette's purse. Why would Meg's prints be on the envelope? She had to be looking for something. That meant Annette had to be dead for her to get her hands on Annette' purse. Plus there were the missing car keys. I still don't exactly agree with her story of how it happened though. I really think there was a little more to it than that.
One thing for sure though is that little town is quite a Peyton Place. I'm sure that the next case is going to be even more interesting.
While I'm on the subject though, I'd like to share a few ideas and see if anyone else might think the same thing.
1.We know the unidentified prints in Annette's house do not belong to anyone at Harte's office.
2.Tara keeps insisting that Jeff had things to hide. In her bio, it stated she had a little girl who was almost 8 and she refused to name the father. That means that she was hiding something and with the remarks about Jeff, I wonder if he could be the father? He and Elana have been married about 8 years.
3. Darren's story was bologna from the beginning. You don't get irate over mentioning a possible other boyfriend and then suddenly go the other way. I think he was following her that day and found out about Kyle. He called her wanting to talk to confront her with it. I think possibly he did and that was why he got roaring drunk. He then told police it was not unusual for her not to show up thinking it would throw suspicion away from him.
4. Jeff still had feelings for Annette and I think they were still seeing each other from time to time and that was why Annette kept staying there. When she had the pregnancy scare, it drew a line between them and she decided it was time to leave. He would never leave Elana, especially now that she was pregnant. Tracking the mole was just an excuse to cover up what she was doing in getting ready to leave.
What does everyone else think?