This is just anecdotal myths, it was probably the depression that was the cause. Why not write an article about chewing gums and the violent crimes...
Depression is associated with suicide, not homicide. If you check the second link in comment# 1, you'll find that mostly all of these school shootings of recent years are associated with this class of antidepresssants, the selective serotonin re-uptake inhibitors, SSRIs, of which Prozac is the grandfather.
All drugs can have adverse effects based on genetic predisposition that determines how individuals metabolize any particular drug. They need to figure out which individuals should not take SSRIs, or else be hospitalized for the first few months of therapy or a change in dosage.
FDA Public Health Advisory October 15, 2004
"Pediatric patients being treated with antidepressants for any indication should be closely observed for clinical worsening, as well as agitation, irritability, suicidality, and unusual changes in behavior, especially during the initial few months of a course of drug therapy, or at times of dose changes, either increases or decreases."
Now this class of drugs has a "Black Box" warning. The kid had his dose of Prozac increased a few weeks ago.
Christopher Pittman, who killed his grandparents in South Carolina while taking Zoloft, was first started on Paxil, another SSRI, about a month before the killing, IIRC. He was switched to Zoloft a week or so after, and then the dose was increased a few days before he killed.