It has come to light that SSRI's like Zoloft can induce akathisia, which is an intense agitation, that may induce violent behaviour. I have to wonder about this case though - they said the guy took 5 times is prescribed dose that night- why?
There have been a number of court cases in the USA where people with no history of violence have committed suicide or homicide whilst on an SSRI. It appears that Eli Lilly, the company that developed Prozac (the first SSRI) had evidence of suicidal ideation occurring while the drug was still in testing, but took steps to avoid revealing this. Which is pretty dodgy, because if patients and families were warned that this could occur, they could seek help for it (using benzodiazepines can assist akathisia). An article in the Age Good Weekend 18/12/99 titled 'To Good to be True' talked about this in great length.
SSRI' s are frequently prescribed by GP's with little monitoring of the patient. Also, as they are seen as safe they are prescribed much more readily than the older anti-depressants, with more troublesome side-effects, ever were. Having said that, plenty of people take these drugs safely and effectively. But people should be given all the info.
I could go on about this all night, but I won't...