Sorry to hear that. Sounds like he was a great guy. Hopefully his passing will be peaceful, with no pain.
Cancer has been all around me the last couple years. Lost a high school friend (age 20) from osteosarcoma, my uncle is extremely sick from leukemia, and likely going into hospice in the next couple weeks, and doctors found metastatic (stage IV) breast cancer (thankfully manageable through estrogen antagonists, though not treatable) in my aunt, a month after a clean mammogram.