Ohhh, I think I know where this is headed, but I'm not sure... the next chapter will either prove or disprove my thoughts, and I can't wait!

If rarity died either spike will get insanely depressed to the point of suicide or he will rage all over town trying to find trixie to rip her apart. If your going to use one of these scenarios into this story, I prefer the 2nd one.

I call red herring on Trixie!

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Stay Tuned!

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Stories already all planned out, we'll just have to see.

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What?!? We aren't cutting down the mightiest tree the in forest here!

When does Twilight start being badass?

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I doubt it. When she was accused of the murder, she didn't try to say she was innocent. She instantly said that she would escape and go after Twilight next.

Okay. I know there is a new chapter out but I have not read it yet and I want to get my predictions down. Here goes.

Trixie is not the killer. She did not lie when Twilight accused her of killing the ponies. If you look back, Twilight also said something before the ruby glowed. She said

“I will do whatever is necessary to protect the ponies of this town, Trixie. You hear me! Anything!”

I think this is the lie that set the ruby aglow. I do not believe that Twilight is willing to kill, and thus she is the liar here. I do think that Trixie was plotting revenge, I just don't think she would kill.

On that note, who do I think is the killer?
Rarity.
Partly a wild guess, but I also have some suggestions that point to it.
The fire ruby was charmed by Rarity when she was alone save for Spike, thus giving her the opportunity to place an additional charm on it to make it not work on her, or at the very least find a way for her to get around it.
Furthermore, I doubt that she was even interrogated. After all, who would suspect an Element of Harmony?
Rarity also has a flare for detail, those little things that make the masterpiece. Usually, an accent in one of her outfits, but in this case the fineness with which she displayed Pinkie's mutilated body.
My last idea for why is that letter removing her guards. She could have forged it to remove any witnesses from her vicinity, then killed one of her customers or family members.

Okay, I admit that last point is weak and this whole theory will probably be blown to bits in the next chapter. Still, until evidence suggesting otherwise, this is my theory and I'm sticking to it.

Another point is that I'm fairly sure RD is going to die at some point, if the cover art is any indication.

I think spike did it

It just all fits if you think about it

“Ponies. Have. DIED!”

Also, if Rarity got killed, it means that I'm so bad at predicting that I'm actually good - everyone whom I predicted to be a killer, ends up as a victim...

Y'know, I really need to stop saying I'll do things soon. I have no sense of time as well as a short attention span. Aw, well. Better late than never. Here goes.

“Its just safer if I go in alone.”

It's as in "it is"

“The people in this blasted town deserve everything they get.”

and

all the people you hurt,

These (as well as a few others) are a more personal opinion of mine, which is that ponies should not be referred to as "people." Personal opinion so, as always, feel free to ignore it.

Forgiveness is cheap your highness.

"Your" and "Highness" should both be capitalized. This happens a few times.

Trixie is happy that Ponyville is finally getting what's coming to them!”

"Them" should be "it", I am mostly sure. Because the word is referring to Ponyville itself and not a group of nouns of any sort, a singular term should be used. If you want to use "them" anyway, you could always add "the ponies of" in front of Ponyville.

Twilight raged in the other unicorns face.

"Unicorn's." Possessive.

I am glad to finally write you with good news your Highness.

Another "Your Highness," but that's not why I pointed this one out. There should be a comma between "news" and "Your," as Twilight is addressing Celestia.

With the assistance of my friends as well as your own royal guard, we have finally captured the murderer, Trixie Lulamoon.

There should be a comma between "friends" and "as" because "as well as your own royal guard" is not strictly needed in the sentence

continue nightly patrol’s for the time being,

Should just be "patrols," without the apostrophe.

“Yes, your highness!” They barked in unison.

"They" shouldn't be capitalized.

I’m sure the Captain wont mind.”

I believe you mean "won't" as in the contraction of "will" and "not." Although "wont" is an actual word, it is not commonly used and would not make sense in this situation.

My partner and I were stationed at the Carousel Boutique.” He said, a slight slur to his words.

Again, "he" should not be capitalized and the period after Boutique should be a comma.

That's all I saw for this chapter. I'm off to do the next right now.

Ok, possible suspects:

Trixie. (Could be exactly what Twilight suspects)
Twilight. (Sent a letter in her sleep)
Spike. (Less likely than last chapter but could have sent a letter)
Rarity. (Could have sent a false letter)