With all of the recent reports of certain anti-depression medication actually causing suicide (such as Prozac (Fluoxetine), Zoloft, Paxil, Luvox, Celexa, Lexapro, Wellbutrin, Effexor,, Serzone, Remeron, etc.), you cannot rule that possibility out either without further information. You never know, he could have started taking new medication or had a recent change in dosage, both have been documented to cause suicidal thoughts in some patients, so there is no need to jump to conclusions.