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— The teenaged girl charged with conspiring with her adult boyfriend to kill her family was worried whether the knife she allegedly used in the crime would do the job, according to a police report obtained by The Detroit News.

According to the report filed by the Western Wayne (Law Enforcement) Task Force, Roksana Sikorski asked her boyfriend, Michael Rivera, 23, "is this sharp enough?" referring to the 6-8-inch filet knife police say the 15-year-old allegedly used to stab her younger brother in the neck.

Sikorski's younger sister, who is 11, screamed that the brother had been stabbed saying, "Lucas just got stabbed by Roxy," according to the police report filed Oct. 17, several hours after the 2 a.m. incident at the family's home in the upscale Heather Hills subdivision near North Territorial and Beck.

Police say the boyfriend stood outside a window of the home giving the girl instructions through text messages. The attack caused "major bleeding," according to the police report.

Sikorski and Rivera face a 35th District Court judge at 9 a.m. Friday for a preliminary examination hearing in the case to determine whether the couple will be bound over for trial on attempted murder and other related charges.

Sikorski, a student at Plymouth Salem High School, is accused of conspiring with Rivera to kill her family. Police said they fled the home before being picked up by two of Rivera's friends and taken to Detroit's southwest side where Sikorski, who was slightly injured from jumping out a window in her family's home, and Rivera were arrested.

Rivera's friends were not charged in the case.

Sikorski's attorney, Leslie Posner of Southfield, said the girl was influenced by Rivera and should be tried as a juvenile. The prosecutor's office, however, said the "alleged facts in this case strongly warrant" charging her as an adult.

Posner said the girl's family also believes she suffers from traumatic stress syndrome and other disorders as a result of being in an abusive home before she and her younger brother and sister were adopted 10 years ago by Laurene, a nurse anesthetist and healthcare manager, and Jeffrey Sikorski, an engineer.

Laurene Sikorski said Roksana is a "loving" girl who "fell under (Rivera's) spell" after meeting him on Facebook around March.

At her arraignment last week, the parents vowed to stand by their daughter, appearing with her in court.

"We're not disowning her," Laurene Sikorski declared. "

Roksana was arraigned on several charges, including attempted murder and conspiracy.

Laurene Sikorski said she and her husband never met Rivera. They say they learned of the relationship when their daughter ran away from home in July to be with her older boyfriend.

"I think it was a big secret. I didn't know about him," her mother said.

Rivera was arraigned earlier this month. According to the police report, Rivera told officers he and the teen talked about and came up "with a plan" to kill Sikorski's family because her parents wanted to send her to "another foster family" to keep him and Roksana apart. He also said he was only "trying to scare" the teen by going along with the plan.

bwilliams@detroitnews.com

(313) 222-2027

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