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CLINTON TWP., Mich. (FOX 2) - Facing life in prison for the heinous murders of his sister and her boyfriend, 24-year-old Robert Marzejka was in shackles and back in court in Clinton Township on Wednesday as the results of his mental evaluation were revealed.

"At this time the people will stipulate to the findings of the report, indicating that the defendant is competent," said Macomb County Assistant Prosecutor William Cataldo.

Police in Cincinnati caught Marzejka in late August, just days after his younger brother discovered the lifeless bodies of their 18-year-old sister Danielle Marzejka and her 19-year-old boyfriend, Seren Bryan.

Both victims were stuffed inside garbage bags in a tool shed right behind their Clinton Township mobile home. A family member says Danielle and Robert's mother died of an overdose in 2011, and that's when Robert Marzejka "snapped." Police say the 24 year old has previously been diagnosed with bipolar disorder.

"I just want to make it clear that ... we may have to bring up those issues again in circuit," said defense attorney Azhar Sheikh.

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Prosecutors are waiting on full toxicology and autopsy reports. The cause of these teen's deaths has not yet been revealed. Prosecutors are preparing for Marzejka's preliminary exam to determine if he will head to trial.

The judge and the defense agreed Marzejka is competent. His next hearing is scheduled for February 4. Prosecutors expect about five or six witnesses to take the stand.