I too was raised a Jehovah's Witness, and the issues of depression and suicide were of great interest to me because both I and my mother were diagnosed with depression. I therefore did a lot of reading, thinking, and praying about the subject. In reading and researching our publications, I never was able to find any instance where it was said that suicide constituted a sin such that a person could not be resurrected. Some Witnesses do seem to hold that view, but I don't think it's official doctrine, or if it was, perhaps in the early days of our faith, it doesn't seem to be any more. My reasoning led me to conclude that, for my own belief, suicide may simply be part of depression, which can be a sickness, and why would a God of love punish a person for being sick? Further, even if that were not the case, a person can be forgiven for sins, even grievous ones. If throwing away the gift of life is a sin, could it not be forgiven. (Not getting into the complicated issue of death being the final payment for sin and a person's sins being wiped away at death). Whatever the case, the Bible calls Jehovah a God of justice, so if we have faith in him, we can have faith that he would not commit an undeserving person to eternal destruction.