NEW: School shooting suspect previously charged for slitting throat of 8-year-old cousin

    Baltimore Police<p>{/p}

    (WBFF) -- New details of a troubled past begin to surface surrounding the suspect in Friday’s school shooting at Frederick Douglass High School.

    Over the weekend police also charged 25-year-old Neil Davis in the November murder of Darelle Yancey.

    FOX 45 has learned Yancey and Davis were cousins.

    According to statements from family, Davis — has been known to have quote mental issues and also a drug problem.

    In 2015, police arrested Davis for attempted murder.

    In that case, Davis is accused of cutting the throat of an eight year cousin as she walked to school.

    At the time, the victim’s siblings told police, Davis was looking for their older brother Darelle.

    In November, Darrelle Yancey was found shot to death.

    Police say evidence collected in the school shooting on Friday linked Davis to the killing.

    Davis remains behind bars facing charges connected to the murder of his 25 year old cousin Darelle Yancey and the attempted murder of Douglass High School staff member Michael Marks.

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