I wondered too after the fact if there was something I should have picked up on/something I could have done or said differently on that phone call. He didn't say anything at all that would have led me to worry about his safety, it was just a pleasant conversation until the phones got busy and I had to hang up because I was at work. We weren't friends outside of work and hadn't really talked much even at work, except for work-related stuff. I didn't know any differently, I mean, at the time I just thought he was bored so he called in. It was not an uncommon thing back then, for my coworkers to call into the 800# knowing me or the opposite-days midnights person would answer and talk if they couldn't sleep in the middle of the night. Most of us were in our 20's and we were a close-knit group of employees, even if we didn't all socialize outside of work. I still have so many memories. Even though I worked through my guilt a long time ago (that maybe I could have done something if I'd known) I still feel sad after 30 years if something reminds me of him (like when recently maybe a month go I had a dream about it. said dream is why it's so fresh in my mind right now.)