TULSA, Okla. — Authorities say a Tulsa woman reached into the casket of her boyfriend’s ex-girlfriend at a funeral home and slashed the dead woman’s face.

Shaynna Sims, 26, was arrested after the alleged incident last Thursday on a preliminary complaint of illegally dissecting a human body, which is a misdemeanor.

She had not been formally charged as of Monday, and online jail records show she remained in jail Monday and has an initial court hearing scheduled for this Thursday. It was unclear whether Sims had an attorney, and a number listed for her home was disconnected. Police declined to provide the name of the deceased and said they didn’t know the name of Sims’ boyfriend. A lawyer who represented her in a prior case didn’t immediately respond to a phone request for comment.

Sgt. Shane Tuell, a police spokesman, said investigators don’t know what led Sims to slash the body of her boyfriend’s ex-girlfriend. He said he didn’t know Sims’ boyfriend’s name and he declined to give the dead woman’s name. John Wilson, the manager at the Moore Funeral Home Eastlawn Chapel, also declined to give her name, saying the woman’s family had asked for privacy.

“I was hoping by now this young lady would have talked and given her motivation behind why she did what she did, but apparently she’s keeping that to herself,” Tuell said.

Witnesses told officers that they saw Sims reach into 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 said.

Wilson said staff there called police after they were alerted to the vandalism by a visitor.

“It’s never happened,” Wilson said Monday. “We have 100 years of experience in this building and nobody’s ever experienced anything like that.”

Officers arrested Sims later Thursday at the dead woman’s apartment, and said she had on her a folding knife with the dead woman’s hair attached to it.