The 26-year-old Shaynna Sims remained jailed Monday and faces a misdemeanor complaint of illegal dissection.
Police spokesman Shane Tuell says Sims is dating the deceased woman's ex-boyfriend.
Officers responded Thursday evening to a report of vandalism after witnesses say Sims placed her hands inside the casket. The dead woman's face was cut from her hairline to the tip of her nose, her makeup was smeared and her hair was on the floor.
Police arrested the suspect at the dead woman's apartment. They say she was carrying a folding knife with the woman's hair still attached.
The dead woman's son told officers the suspect told him she wanted inside to get jewelry for the funeral.
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