Nia Lahey was the wife of Nate Lahey. She had stage 4 cancer and was usually in the hospital. Nia was aware of Annalise and Nate's relationship, but she permitted it because she knew she would die soon. Nia also asked Annalise to have Frank get sleeping pills for her so she could commit suicide, but Annalise ultimately refused. She believed that Annalise killed Sam.
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Trivia
Although her first appearance wasn't until Season 2, when looking at Nate's emails in "Freakin' Whack-a-Mole", it is shown that she has been emailing him multiple times regarding various things.[1]