Prozac has a long half life, which means it takes two to three weeks to work or get out of one’s system…unlike shorter acting anti depressants.

For people on long term anti depressants, there is a mild “withdrawal”, but it is rare on Prozac because the half life is long and the withdrawal slope is low.

In other words, we can’t blame it on Prozac or on Prozac withdrawal.

From what some say, he was a normal kid. Schizophrenics are often described as “weird” because of their flat affect. He was also being treated for “obsessive compulsive” symptoms.

But OCD isn’t associated with paranoia. However, bipolar disease is, and acute paranoid delusions can be found in the manic phase. And cases are often misdiagnosed, especially early in the disease.

Giving anti depressants can “flip” a depression into a manic phase of bipolar, but if this was the problem, friends could report he was up all night, taking downers, hypersexual, spending like mad etc. before the rampage.

So without a firm “psychiatric autopsy” we will never know.