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While reading a manga, which takes place during the samurai era, I came across the statement:
弟の鉄之助は中岡隊長の言うちょった犯人の特徴とピッタリ合うちょるきに…！
I'm pretty sure it translates roughly to something like
The younger brother Tetsunosuke matched the description of the culprit given by Captain Nakaoka perfectly!
My question is the meaning of the "ちょった/ちょる" following the verbs as well as the "きに" at the end.
According to Wikipedia article 「日本の方言」, ～ちょる means ～ている in western dialect. It says that they use 「音便形＋ちょる・ちょー」 for ～ている in 島根県出雲, and 「音便形＋ちょる・ちょー」 for ～ている as 完了後の状態を表す相 (perfect aspect) in 岐阜県・奈良県南部・兵庫県播磨・中国地方（出雲除く）・四国地方・九州地方.
And according to here in the same article, ～きに is a 接続助詞(conjunctive particle) of 理由(reason) in western dialect. They use 「けん・けー・きん・きー・けに・きに」 in 中国地方・四国地方・九州地方（宮崎県・鹿児島県を除く）.
So [合]{お}うちょるきに means [合]{あ}っているから, and [言]{ゆ}うちょった means [言]{い}っていた.
I looked them up online, and the sources I found (this is one of the sources: http://www.ilovex.co.jp/ilo_week/2007/08/post-117.html) say that
"ちょった/ちょる” means "ていた/ている”
and
"きに” means "（のです）から”
So, "合うちょるきに” in your example sentence must be able to be rephrased as "合っている（のです）から", which makes your translation correct. They say that these terms are dialect called 「[土佐弁]{とさべん｝」 spoken mainly in [高知県]{こうちけん} in [四国]{しこく}.
The question got me curious and I made some research.
Apparently ちょる could be a dialectal form of ておる in some areas in western Japan.
Some Japanese people say that this form is commonly used in 山口県, 大分県, and 福岡県 for example (see here http://detail.chiebukuro.yahoo.co.jp/qa/question_detail/q1165856011).
From the same link you can also get to a Wikipedia page regarding western Japan dialect with more details:
https://ja.wikipedia.org/wiki/%E8%A5%BF%E6%97%A5%E6%9C%AC%E6%96%B9%E8%A8%80
