Here are a few morbid ones, not necessarily suicide ones. I'll try to find some suicide ones some other time.
My grief counselor died. He was so good, I don't even care.
My mom died when we couldn't remember her blood type. As she died, she kept telling us to "be positive," but it's hard without her.
Give a man a match, and he'll be warm for a few hours. Set him on fire, and he will be warm for the rest of his life.
A priest asks the convicted murderer at the electric chair, "Do you have any last requests?" "Yes," replies the murderer. "Can you please hold my hand?"
The doctor gave me one year to live, so I shot him with my gun. The judge gave me 15 years. Problem solved.
Cremation. My final hope for a smokin' hot body!