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BETHESDA, Md. (WUSA9) -- The woman convicted of killing a co-worker at the Bethesda Lululemon Athletica store wants a new trial.

Brittany Norwood says prosecutors relied on police interviews which were conducted without reading her Miranda rights. Her attorney, Christopher Griffiths, filed a notice of appeal with the Maryland Special Court of Appeals Monday night.

Prosecutors say they stand by the way they handled the case.

Norwood is serving a life sentence for killing Jayna Murray in 2011 after Murray discovered some clothing from the store inside Norwood's bag and told the manager.

PHOTOS: Bethesda Lululemon murder evidence

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Investigators say Norwood beat Murray in the head so many times it's impossible to count, crushing her skull and tying something around her neck that severed her spinal cord.

Norwood allegedly moved Murray's car and sat in it for an hour and a half before going back to the store, ripping Murray's pants to make it look like she'd been sexually assaulted.

Norwood allegedly sliced superficial cuts in her own body and tied herself with zip ties. Police say she pulled them closed with her teeth to make it look like someone else had committed the murder.

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