Japanese by Example
Learning through examples in manga

Don't suspect only me with 〜だけ

名探偵コナン » Volume 11 » Page 10

In a snow-covered mountain villa, a room full of suspects listens as Detective Mouri explains how their host was murdered. The accused notes she has a receipt showing she was at the convenience store at the bottom of the mountain when the murder took place.

中原(なかはら):
「それにまだ金澤(かなざわ)先生(せんせい)のアリバイもあやふやよ!!」
"Moreover, Mr. Kanazawa's alibi is also vague!"
(わたし)だけ犯人(はんにん)(あつか)いしないでよ!!」
"Don't treat only me as the suspect!"

だけ limits the object being treated as a suspect to 「(わたし)」.